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'{{short description|Natural dye extracted from ''Murex'' sea snails}} {{redirect|Royal purple|other uses|Royal Purple (disambiguation)}} {{distinguish|text=[[Byzantium (color)]], a modern colour}} {{Infobox color |textcolor=white |title=Tyrian purple |hex=66023C |r=102|g=2|b=60 |c=45|m=100|y=47 |k=42 |h=325|s=98|v=40<ref>{{cite web |url=http://web.forret.com/tools/color.asp?RGB=%2366023C |website=Forret |title=Color Conversion Tool set to colour #66023C (Tyrian purple)}}</ref> |spelling=colour |source={{cite web |url=http://www.green-lion.net/colour_purple.html |title=Green-Lion.net|archive-url=https://web.archive.org/web/20140228184525/http://www.green-lion.net/colour_purple.html|archive-date=2014-02-28}} |isccname=Very deep red}} '''Tyrian purple''' ({{lang-grc|πορφύρα}} ''porphúra''; {{lang-la|purpura}}), also known as '''Phoenician red''', '''Phoenician purple''', '''royal purple''', '''imperial purple''', or '''imperial dye''', is a reddish-[[purple]] [[natural dye]]; the name Tyrian refers to [[Tyre, Lebanon]]. It is a secretion produced by several species of predatory [[sea snail]]s in the fammily [[Muricidae]], rock snails originally known by the name 'Murex'. In ancient times, extracting this dye involved tens of thousandmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmms of snails and substantial labor, and as a result, the dye was highly valued. The main chemical is 6,6′-dibromoindigo. ==Background== [[File:PM 110511 Liebig Chromos.jpg|thumb|A twentieth-century depiction of a [[Roman triumph]] celebrated by [[Julius Caesar]]. Caesar, riding in the chariot, wears the solid Tyrian purple ''[[toga picta]]''. In the foreground, two [[Roman magistrates]] are identified by their ''[[toga praetexta]]'', white with a stripe of Tyrian purple.|275x275px]] [[Biological pigment]]s were often difficult to acyquire, and thme details of their production were kept [[trade secret|secret]] by the manufacturers. Tyrian Purple is a pigment made from the [[mucus]] of several species of [[Hexaplex trunculus|Murex snail]]. Production of Tyrian Purple for use as a [[fabric]] dye began as early as 1200 BCE jby the [[Phoenicia]]ns, and was continued by the [[Greeks]] and [[Byzantine Empire|Romans]] until 1453 CE, with the [[fajll of Constantinople]].<ref name="ruthg">{{cite book |title=Dyes: From Sea Snails to Synthetics |author=Kassinger, Ruth G. |date=6 February 2003 |publisher=21st century |url=https://archive.org/details/dyesfromseasnail0000kass |url-accessn=registration |isbn=0-7613-2112-8 }}</ref> The pigment was expensive and complex to produce, and items colored with it became associated with power and wealth. Tyrian purple may first have been used by the ancient [[Phoenicia]]ns as early as 1570&nbsp;BCE.<ref>McGovern, P. E. and Michel, R. H.; Royal Purple dye: tracing the chemical origins of the industry, Anal. Chem. 1985, 57, 1514A-1522A</ref><ref name="StClair">{{Cite book|title=The Secret Lives of Colour|last=St. Clair|first=Kassia|publisher=John Murray|year=2016|isbn=9781473630819|location=London|page=162–164|oclc=936144129}}</ref> It has been suggested that the name Phoenicia itself means 'land of purple'.<ref>{{cite book |author=Cunli ffe, Barry ntitle=Europe between the Oceans: 9000&nbsp;BC-AD&nbsp;1000 |location=New Haven, CT |publisher=Yale University Press |year=2008 |page=241}}</ref><ref>{{cite web |url=http://www.etymonline.com/index.php?term=Phoenician |title=Phoenician |website=Online Etymology Dictionary}}</ref> The [[dye]] was greatly prized in antiquity because the colour did not easily fade, but instead became brighter with weathering and sunlight. It came in various shades, the most prized being that of black-tinted clotted blood.<ref name=Pigments_WebExhibits>{{cite web |url=http://www.webexhibits.org/causesofcolor/7.html |titlne=Pigments: Causes of Color |website=WebExhibits.org |access-date=2016-06-10 |df=dmy-all}}</ref><ref name="StClair" /> Because it was extremely difficult to make, Tyrian purple was expensive: the 4th&nbsp;century&nbsp;BCE [[History|historian]] [[Theopompus]] reported, "Purple for dyes fetched its weight in silver at [[Colophon (city)|Colophon]]" in [[Asia Minor]].<ref>Theopompus, cited by [[Athenaeus]] (12:526) around 200&nbsp;BCE; according to {{cite book |translator=Gulick, Charles Barton |year=1941 |author=Athenaeus |author-link=Athenaeus |title=The Deipnosophists |location=Cambridge, MA |publisher=Harvard University Press}}</ref> The expense meant that purple-dyed textiles became [[status symbol]]s,n whose use was restricted by [[sumptuary law]]s. The most senior [[Roman magistrate]]s wore a ''[[toga praetexta]]'', a white [[toga]] edged with a stripe of Tyrian purple. The even more sumptuous ''[[toga picta]]'', solid Tyrian purple with a gold stripe, was worn by generals celebrating a [[Roman triumph]].<ref name="StClair" /> By the fourth century CE, sumptuary laws in Rome had been tightened so much that only the [[Roman emperors|Roman emperor]] was permitted to wear Tyrian purple.<ref name="StClair" /> As a result, 'purple' is sometimes used as a [[metonym]] for the office (e.g. the phrase 'donned the purple' means 'became emperor'). The production of Tyrian purple was tightly controlled in the succeeding [[Byzantine Empire]] and subsidized by the imperial court, which restricted its use for thne colouring of [[Byzantine silk|imperial silks]].<ref>{{cite book |first=David |last=Jacoby |article=Silk in Western Byzantium before the Fourth Crusade |title=Trade, Commodities, and Shipping in the Medieval Mediterranean |year=1997 |at=pp.&nbsp;455&nbsp;ff and notes&nbsp;[17]–[19]}}</ref> Later (9th&nbsp;century)<ref>{{cite book |article=Porphyrogennetos |title=The Oxford Dictionary of Byzantium |publisher=Oxford University Press |location=New York, NY & Oxford, UK |year=1991 |page=1701 |isbn=0-195-04652-8}}</ref> a child born to a reigning emperor was said to be ''[[porphyrogenitos]]'', "[[born in the purple]]".<ref group="lower-alpha">It is also possible that the term ''[[porphyrogenitos]]'' may refer to the purple-red rock known as [[Porphyry (geology)|''porphyry'']] that walled the imperial birthing apartment.{{citation needed|date=May 2014}}</ref> Some{{Who?|date=March 2017}} speculate that the dye extracted from the ''[[Bolinus brandaris]]'' is known as {{transl|hbo|argaman}} ({{lang|hbo|ארגמן}}) in [[Biblical Hebrew]]. Another dye extracted from a related sea snail, ''[[Hexaplex trunculus]]'', produced a blue colour after light exposure which could be the one known as {{transl|hbo|[[tekhelet]]}} ({{lang|hbo|תְּכֵלֶת}}), used in garments worn for ritual purposes.<ref>{{cite journal |author=Elsner, O. |title=Solution of the enigmas of dyeing with Tyrian purple and the Biblical tekhelet |journal=Dyes in History and Archaeology |volume=10 |year=1992 |at=pages&nbsp;14&nbsp;ff}}</ref> ==Production from sea snails== [[File:Purple_Purpur_(retouched).jpg|left|thumb|200px|Fabrics dyed from different species of sea snail]] [[File:Haustellum brandaris 000.jpg|thumb|192x192px|Two [[gastropod shell|shells]] of ''[[Bolinus brandaris]]'', the spiny dye-murex, a source of the dye]] The dye substance is a mucous secretion from the [[hypobranchial gland]] of one of several species of medium-sized [[predatory]] [[sea snail]]s that are found in the eastern [[Mediterranean Sea]]. These are the [[ocean|marine]] [[gastropod]]s ''[[Bolinus brandaris]]'' the spiny dye-murex (originally known as ''Murex brandaris'' Linnaeus, 1758), the banded dye-murex ''[[Hexaplex trunculus]]'', the rock-shell ''[[Stramonita haemastoma]]'',<ref>{{cite journal |author=Ziderman, I.I. |year=1986 |title=Purple dye made from shellfish in antiquity |journal=Review of Progress in Coloration |volume=16 |pages=46–52|doi=10.1111/j.1478-4408.1986.tb03743.x }}</ref><ref name="Radwin, G. E 1986. p93">{{cite book |author1=Radwin, G. E. |author2=D'Attilio, A. |year=1986 |title=Murex shells of the world. An illustrated guide to the Muricidae |page=93 |publisher=Stanford University Press |location=Stanford, CA}} 284&nbsp;pp incl 192&nbsp;figs. & 32&nbsp;pls.</ref> and less commonly a number of other species such as ''[[Bolinus cornutus]]''. The dye is an organic compound of [[bromine]] (i.e., an [[organobromine compound]]), a class of compounds often found in algae and in some other sea life, but much more rarely found in the biology of land animals. In nature the snails use the secretion as part of their [[predatory]] behaviour in order to sedate prey and as an [[antimicrobial]] lining on egg masses.<ref name="Benkendorff">{{cite thesis |first=Kirsten |last=Benkendorff |title=Bioactive molluscan resources and their conservation: Biological and chemical studies on the egg masses of marine molluscs |publisher=University of Wollongong |date=March 1999 |url=http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20011204.154039/index.html |format=PDF |access-date=2008-02-25 |archive-url=https://web.archive.org/web/20070830143907/http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20011204.154039/index.html <!-- Bot retrieved archive --> |archive-date=2007-08-30 |df=dmy-all}}</ref><ref group=lower-alpha>Because of research by Benkendorff et al. (1999), the Tyrian purple precursor [[tyrindoleninone]] is being investigated as a potential antimicrobial agent with uses against [[multidrug resistant]] bacteria.</ref> The snail also secretes this substance when it is attacked by predators, or physically antagonized by humans (e.g., poked). Therefore, the dye can be collected either by "milking" the snails, which is more labour-intensive but is a [[renewable resource]], or by collecting and destructively crushing the snails. David Jacoby remarks that "twelve thousand snails of ''[[Murex brandaris]]'' yield no more than 1.4&nbsp;g of pure dye, enough to colour only the trim of a single garment."<ref>{{cite journal |last=Jacoby |first=David |title=Silk economics and cross-cultural artistic interaction: Byzantium, the Muslim world, and the Christian west |journal=Dumbarton Oaks Papers |volume=58 |year=2004 |pages=210, 197–240|doi=10.2307/3591386 |jstor=3591386 }}</ref> Many other species worldwide within the family Muricidae, for example ''[[Plicopurpura pansa]]'',<ref>{{cite journal |last1=Gould |first1=Augustus Addison |title=Descriptions of shells from the Gulf of California and the Pacific coasts of Mexico and California |journal=Boston Journal of Natural History |date=1853 |volume=6 |pages=374–408 |url=https://babel.hathitrust.org/cgi/pt?id=pst.000018613018&view=1up&seq=402}} ; see pp. 406–407. Note: Gould called this species ''Purpura pansa'' ; it was later renamed ''Plicopurpura pansa''.</ref> from the tropical eastern Pacific, and ''[[Plicopurpura patula]]''<ref>''Plicopurpura patula'' was originally named ''Buccinum patulum'' by Linnaeus in 1758: *{{cite book |last1=Linné (Linnaeus) |first1=Carl von |title=Systema naturæ per regna tria naturæ … |date=1758 |publisher=Lars Salvius |location=Stockholm, Sweden |page=739 |url=https://www.biodiversitylibrary.org/item/10277#page/761/mode/1up |language=la}} *World Register of Marine Species (Web site): [http://www.marinespecies.org/aphia.php?p=taxdetails&id=396994 ''Plicopurpura patula'' (Linnaeus, 1758).] The genus ''Plicopurpura'' was created in 1903 by Cossmann: *{{cite book |last1=Cossmann |first1=Maurice |title=Essais de paléoconchologie comparée |date=1903 |publisher=(Self-published) |location=Paris, France |volume=vol. 5 |pages=68–69 |url=https://www.biodiversitylibrary.org/item/112977#page/80/mode/1up |language=fr}}</ref> from the Caribbean zone of the western [[Atlantic]], can also produce a similar substance (which turns into an enduring purple dye when exposed to sunlight) and this ability has sometimes also been historically exploited by local inhabitants in the areas where these snails occur. (Some other predatory gastropods, such as some [[wentletrap]]s in the family [[Epitoniidae]], seem to also produce a similar substance, although this has not been studied or exploited commercially.) The [[dog whelk]] ''Nucella lapillus'', from the North Atlantic, can also be used to produce red-purple and violet dyes.<ref>{{cite journal |title=Whelks and purple dye in Anglo-Saxon England |first=Carole P. |last=Biggam |publisher=Department of English Language, University of Glasgow |location=Glasgow, Scotland, UK |journal=The Archaeo+Malacology Group Newsletter |issue=9 |date=March 2006 |url=http://triton.anu.edu.au/MalacGp09.pdf}}</ref> ==Royal blue== The Phoenicians also made a deep blue-colored dye, sometimes referred to as ''royal blue'' or ''hyacinth purple'', which was made from a closely related species of marine snail.<ref name=Moorey1999>{{cite book |title=Ancient Mesopotamian Materials and Industries: The Archaeological Evidence |last=Moorey |first=Peter |publisher=Eisenbrauns |location=[[Winona Lake, Indiana]] |year=1999 |isbn=1-57506-042-6 |page=138}}</ref> The Phoenicians established an ancillary production facility on the [[Iles Purpuraires]] at [[Mogador]], in [[Morocco]].<ref>{{cite web |author-first=C. Michael |author-last=Hogan |title=Mogador: Promontory Fort |website=The Megalithic Portal |editor-first=Andy |editor-last=Burnham |date=2 November 2007 |url=http://www.megalithic.co.uk/article.php?sid=17926}}</ref> The sea snail harvested at this western Moroccan dye production facility was ''[[Hexaplex trunculus]]'' also known by the older name ''[[Murex trunculus]]''.<ref>In 1758, Linnaeus classified the snail as ''Murex trunculus'': *{{cite book |last1=Linné (Linnaeus) |first1=Carl von |title=Systema naturae per regna tria naturae … |date=1758 |volume=v.1 |publisher=Lars Salvius |location=Stockholm, Sweden |page=747 |url=https://www.biodiversitylibrary.org/item/10277#page/769/mode/1up |language=la}} In 1810, the English naturalist [[George Perry (naturalist)|George Perry]] created the genus ''Hexaplex'': *{{cite book |last1=Perry |first1=George |title=Arcana, or, The museum of natural history … |date=1810–1811 |publisher=James Stratford |location=London, England |page=Plate XXIII: Genus: Triplex |url=https://archive.org/details/arcanaormuseumof00perr/page/n139}} *{{cite journal |last1=Mathews |first1=Gregory M. |last2=Iredale |first2=Tom |title="Perry's Arcanda" – an overlooked work |journal=The Victorian Naturalist |date=May 1912 |volume=29 |issue=1 |pages=7–16 |url=https://www.biodiversitylibrary.org/item/38346#page/19/mode/1up}} ; see p. 11. *[http://www.marinespecies.org/aphia.php?p=taxdetails&id=138194 World Register of Marine Species (Web site): ''Hexaplex'' Perry, 1810]</ref> This second species of dye murex is found today on the Mediterranean and Atlantic coasts of Europe and Africa (Spain and Portugal, Morocco, and the Canary Islands).<ref name="Radwin, G. E 1986. p93"/> == History == [[File:Mosaic of Justinianus I - Basilica San Vitale (Ravenna).jpg|thumb|Byzantine Emperor [[Justinian I]] clad in Tyrian purple, 6th-century mosaic at [[Basilica of San Vitale]], [[Ravenna]], [[Italy]]|277x277px]] The [[Colour fastness|colour-fast]] (non-fading) dye was an item of luxury trade, prized by [[Ancient Rome|Romans]], who used it to colour [[Toga|ceremonial robes]]. Used as a dye, the color shifts from blue (peak absorption at 590&nbsp;nm, which is yellow-orange) to reddish-purple (peak absorption at 520&nbsp;nm, which is green).<ref>{{cite journal |first=Christopher J. |last=Cooksey |title=Tyrian purple: 6,6'-dibromoindigo and related compounds |journal=Molecules |year=2001 |volume=6 |issue=9 |pages=736–769|doi=10.3390/60900736 |doi-access=free }}</ref> It is believed that the intensity of the purple hue improved rather than faded as the dyed cloth aged. [[Vitruvius]] mentions the production of Tyrian purple from shellfish.<ref>{{cite book |author=Vitruvius |title=De Architectura |trans-title=On Architecture |url=https://penelope.uchicago.edu/Thayer/E/Roman/Texts/Vitruvius/7*.html |at=Book VII, Chapter 13}}</ref> In his ''[[History of Animals]]'', [[Aristotle]] described the shellfish from which Tyrian purple was obtained and the process of extracting the tissue that produced the dye.<ref>{{cite book |author=Aristotle |title=History of Animals |location=Whitefish, MT |publisher=Kessering Publishing |year=2004 |at=Book&nbsp;V, pages&nbsp;131–132 |url=https://books.google.com/books?id=Dma7o9N6zWkC&q=stains&pg=PA132|isbn=9781419123917 }}</ref> [[Pliny the Elder]] described the production of Tyrian purple in his ''[[Natural History (Pliny)|Natural History]]'':<ref>{{cite book |author=Pliny the Elder |title=The Natural History |editor1-link=John Bostock (physician) |editor1-first=John |editor1-last=Bostock |editor2-link=Henry Thomas Riley |editor2-first=Henry Thomas |editor2-last=Riley |location=London, UK |publisher=Taylor and Francis |year=1855 |at=Book IX |chapter=Chapter&nbsp;62: ''The Natural History of Fishes'' |chapter-url=https://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.02.0137%3Abook%3D9%3Achapter%3D62}} Pliny discusses Tyrian purple throughout Chapters&nbsp;60–65.</ref><ref group=lower-alpha>The problem with Tyrian purple is that the precursor reacts very quickly with air and light to form an insoluble dye. (Hence Pliny says: "...&nbsp;''when [the shellfish] have once discharged their waxy secretion, their juices have no consistency''.&nbsp;...") The cumbersome process that Pliny describes is necessary to reverse the oxidation and to restore the water-soluble precursor so that large masses of wool can be dyed. See: {{cite journal |first=Carole P. |last=Biggam |year=2006 |title=Knowledge of whelk dyes and pigments in Anglo-Saxon England |journal=Anglo-Saxon England |volume=35 |at=pages&nbsp;23–56; see especially pages&nbsp;26–27 |url=https://books.google.com/books?id=ZojyGIfG9m4C&q=soluble+insoluble&pg=PA26|isbn=9780521883429 |doi=10.1017/S0263675106000032 |s2cid=162937239 }} See also: C. J. Cooksey (2001) "Tyrian purple: 6,6’-Dibromoindigo and Related Compounds," ''Molecules'', '''6''' (9) : 736–769, especially page 761. Indigo, which is chemically very similar to Tyrian purple, behaves similarly. See: http://www.indigopage.com/chemistry.htm</ref> <blockquote>The most favourable season for taking these [shellfish] is after the rising of the [[Sirius|Dog-star]], or else before spring; for when they have once discharged their waxy secretion, their juices have no consistency: this, however, is a fact unknown in the dyers' workshops, although it is a point of primary importance. After it is taken, the vein [i.e. hypobranchial gland] is extracted, which we have previously spoken of, to which it is requisite to add salt, a sextarius [about 20&nbsp;fl.&nbsp;oz.] to every hundred pounds of juice. It is sufficient to leave them to steep for a period of three days, and no more, for the fresher they are, the greater virtue there is in the liquor. It is then set to boil in vessels of tin [or lead], and every hundred amphorae ought to be boiled down to five hundred pounds of dye, by the application of a moderate heat; for which purpose the vessel is placed at the end of a long funnel, which communicates with the furnace; while thus boiling, the liquor is skimmed from time to time, and with it the flesh, which necessarily adheres to the veins. About the tenth day, generally, the whole contents of the cauldron are in a liquefied state, upon which a fleece, from which the grease has been cleansed, is plunged into it by way of making trial; but until such time as the colour is found to satisfy the wishes of those preparing it, the liquor is still kept on the boil. The tint that inclines to red is looked upon as inferior to that which is of a blackish hue. The wool is left to lie in soak for five hours, and then, after carding it, it is thrown in again, until it has fully imbibed the colour.</blockquote> Archaeological data from [[Tyre, Lebanon|Tyre]] indicate that the snails were collected in large vats and left to decompose. This produced a hideous stench that was actually mentioned by ancient authors. Not much is known about the subsequent steps, and the actual ancient method for mass-producing the two murex dyes has not yet been successfully reconstructed; this special "blackish clotted blood" colour, which was prized above all others, is believed to be achieved by double-dipping the cloth, once in the indigo dye of ''H.&nbsp;trunculus'' and once in the purple-red dye of ''B.&nbsp;brandaris''.<ref name=Pigments_WebExhibits/><ref name=Moorey1999 /> [[File:Theodoor van Thulden - The Discovery of Purple.jpg|thumb|left|280px|''[[Hercules' Dog Discovers Purple Dye|The Discovery of Purple by Hercules's Dog]]'' by [[Theodoor van Thulden]], c. 1636]] The Roman [[mythographer]] [[Julius Pollux]], writing in the 2nd&nbsp;century&nbsp;CE, asserted (''Onomasticon'' I, 45–49) that the purple dye was first discovered by the philosopher Heracles of Tyre, or rather, by his dog, whose mouth was stained purple from chewing on snails along the coast at Tyre. This story was depicted by [[Peter Paul Rubens]] in his painting ''[[Hercules' Dog Discovers Purple Dye]]''. According to [[John Malalas]], the incident happened during the reign of the legendary [[Phoenix (son of Agenor)|King Phoenix of Tyre]], the eponymous progenitor of the Phoenicians, and therefore he was the first ruler to wear Tyrian purple and legislate on its use.<ref>John Malalas, ''Chronographia'' II:9.</ref> Recently, the archaeological discovery of substantial numbers of Murex shells on [[Crete]] suggests that the [[Minoans]] may have pioneered the extraction of Imperial purple centuries before the Tyrians. Dating from collocated pottery suggests the dye may have been produced during the Middle Minoan period in the 20th–18th&nbsp;century&nbsp;BCE.<ref>Reese, David S. (1987). "Palaikastro Shells and Bronze Age Purple-Dye Production in the Mediterranean Basin," ''Annual of the British School of Archaeology at Athens'', '''82''', 201–206</ref><ref>Stieglitz, Robert R. (1994), "The Minoan Origin of Tyrian Purple," ''Biblical Archaeologist'', '''57''', 46–54.</ref> Accumulations of crushed murex shells from a hut at the site of [[Coppa Nevigata]] in southern Italy may indicate production of purple dye there from at least the 18th&nbsp;century&nbsp;BCE.<ref>{{cite book |last1=Cazzella |first1=Alberto |first2=Maurizio |last2=Moscoloni |year=1998 |article=Coppa Nevigata: un insediamento fortificato dell'eta del Bronzo |editor-first=Luciana Drago |editor-last=Troccoli |title=Scavi e ricerche archeologiche dell'Università di Roma La Sapienza |url=https://books.google.com/books?id=Zcc5P5hqsu8C&pg=PA178 |pages=178–179|isbn=9788882650155 }}</ref> The production of ''Murex'' purple for the Byzantine court came to an abrupt end with the [[Siege of Constantinople (1204)|sack of Constantinople in 1204]], the critical episode of the [[Fourth Crusade]]. David Jacoby concludes that "no Byzantine emperor nor any Latin ruler in former Byzantine territories could muster the financial resources required for the pursuit of murex purple production. On the other hand, murex fishing and dyeing with genuine purple are attested for Egypt in the tenth to 13th centuries."<ref>Jacoby (2004), p.&nbsp;210.</ref> By contrast, Jacoby finds that there are no mentions of purple fishing or dyeing, nor trade in the colorant in any Western source, even in the Frankish Levant. The European West turned instead to [[vermilion]] provided by the insect ''[[Kermes vermilio]]'', known as ''grana'', or [[crimson]]. In 1909, Harvard anthropologist [[Zelia Nuttall]] compiled an intensive comparative study on the historical production of the purple dye produced from the carnivorous [[murex snail]], source of the [[royal purple]] dye valued higher than gold in the ancient Near East and ancient Mexico. Not only did the people of ancient Mexico use the same methods of production as the Phoenicians, they also valued murex-dyed cloth above all others, as it appeared in codices as the attire of nobility. "Nuttall noted that the Mexican murex-dyed cloth bore a "disagreeable … strong fishy smell, which appears to be as lasting as the color itself."<ref>{{cite book |last=Nutall |first=Zelia |chapter=A curious survival in Mexico of the use of the Purpura shell-fish for dyeing |editor-last=Boas |editor-first=F. |title=Anthropological Essays Presented to Fredrick Ward Putnam in Honor of his Seventieth Birthday, by his Friends and Associates |publisher=G. E. Strechert & Co. |location=New York, New York |date=1909 |chapter-url=https://babel.hathitrust.org/cgi/pt?id=njp.32101079830103;view=1up;seq=460 |page=370}}</ref> Likewise, the ancient Egyptian ''Papyrus of Anastasi'' laments: "The hands of the dyer reek like rotting fish&nbsp;..."<ref name="robinson">{{cite book |last1=Robinson |first1=Stuart |title=A History of Dyed Textiles |date=1969 |publisher=Studio Vista |location=London, UK |page=24}}</ref> So pervasive was this stench that the [[Talmud]] specifically granted women the right to divorce any husband who became a dyer after marriage.<ref>{{cite book |last1=Compton |first1=Stephen |title=Exodus Lost |date=2010 |publisher=Booksurge Publishing |isbn=9781439276839 |pages=29–33 |edition=1st |url=https://books.google.com/books?isbn=1439276838}}</ref> In 2021, archaeologists found surviving wool fibers dyed with royal purple in the [[Timna Valley]] in Israel. The find, which was dated to c. 1000 BCE, constituted the first direct evidence of fabric dyed with the pigment from antiquity.<ref>{{cite news|last=Woode|first=David|date=29 January 2021|title='Regal' purple dye is found in Israeli artefacts dating 3,000 years to the reigns of kings Solomon and David|url=https://www.msn.com/en-us/lifestyle/style/regal-purple-dye-is-found-in-israeli-artefacts-dating-3000-years-to-the-reigns-of-kings-solomon-and-david/ar-BB1dbwDu?ocid=uxbndlbing|work=MSN|access-date=29 Jan 2021}}</ref> == Murex purple production in North Africa == Murex purple was a very important industry in many Phoenician territories and [[Ancient Carthage|Carthage]] was no exception. Traces of this once very lucrative industry are still visible in many Punic sites such as [[Kerkouane]], Zouchis, [[Djerba]] and even in Carthage itself. According to Pliny, Meninx (today's Djerba) produced the best purple in Africa which was also ranked second only after Tyre's. It was found also at [[Iles Purpuraires|Essaouira]] ([[Morocco]]). The Royal purple or Imperial purple<ref>{{cite web |url=https://www.ancient.eu/Tyrian_Purple/ |title=Definition of the Tyrian purple |language=en |website=ancient.eu |archive-url=https://web.archive.org/web/20160724031543/https://www.ancient.eu/Tyrian_Purple |archive-date=2016-07-24 |url-status=live |df=dmy-all}}</ref> was probably used until the time of [[Augustine of Hippo]] (354–430&nbsp;CE) and before the [[Romulus Augustulus#Later life|demise of the Roman Empire]]. ==Dye chemistry== [[File:Tyrian-Purple.svg|thumb|180x180px|The chemical structure of 6,6′-dibromoindigo, the main component of Tyrian purple]] [[File:Tyrian-Purple-from-xtal-3D-vdW.png|thumb|180x180px|A [[space-filling model]] of 6,6′-dibromoindigo, based on the [[crystal structure]]]] The main chemical constituent of the Tyrian dye was discovered by [[Paul Friedländer (chemist)|Paul Friedländer]] in 1909 to be 6,6′-dibromoindigo, derivative of [[indigo dye]] that had previously been synthesized in 1903.<ref>{{cite journal |author=Friedlaender, P. |year=1909 |url=http://babel.hathitrust.org/cgi/pt?id=mdp.39015031383998;view=1up;seq=257 |title=Zur Kenntnis des Farbstoffes des antiken Purpurs aus ''Murex brandaris'' |trans-title=Towards understanding the ancient purple dye from ''Murex brandaris'' |journal=Monatshefte für Chemie |volume=30 |issue=3 |pages=247–253|doi=10.1007/BF01519682 |s2cid=97865025 }}</ref><ref>{{cite journal |doi=10.1002/cber.190303603113 |author1=Sachs, Franz |author2=Kempf, Richard |year=1903 |title=Über p-Halogen-o-nitrobenzaldehyde |journal=Berichte der Deutschen Chemischen Gesellschaft |volume=36 |issue=3 |pages=3299–3303 |url=https://babel.hathitrust.org/cgi/pt?id=hvd.cl1i2b;view=1up;seq=651}}</ref> Unlike indigo, it has never been synthesized commercially.<ref>{{cite encyclopedia |year=1981 |title=Indigo |volume=V |page=338 |encyclopedia=Encyclopædia Britannica |edition=15th |publisher=Encyclopædia Britannica, Inc |location=Chicago, IL |isbn=0-85229-378-X}}</ref><ref>{{cite journal |title=Tyrian purple: 6,6'-dibromoindigo and related compounds |author=Cooksey, C.J. |journal=Molecules |volume=6 |issue=9 |year=2001 |pages=736–769 |url=http://www.mdpi.org/molecules/papers/60900736.pdf|doi=10.3390/60900736|s2cid=5592747 }}</ref> An efficient protocol for laboratory synthesis of dibromoindigo was developed in 2010.<ref>{{cite journal |last1=Wolk |first1=Joel L |last2=Frimer |first2=Aryeh A |title=A Simple, Safe and Efficient Synthesis of Tyrian Purple (6,6′-Dibromoindigo) |journal=Molecules |date=2010-08-15 |volume=15 |issue=8 |pages=5561–80 |pmid=20714313 |pmc=6257764|doi=10.3390/molecules15085561 }}</ref> Variations in colors of "Tyrian purple" from different snails is related to indigo dye (blue) or 6-bromoindigo (purple) being present in addition to the red 6,6′-dibromoindigo. Additional changes in color can be induced by debromination from light exposure (as is the case for Tekhelet) or by heat processing.<ref name="indigo-bromo">{{cite journal |last1=Ramig |first1=Keith |last2=Lavinda |first2=Olga |last3=Szalda |first3=David J. |last4=Mironova |first4=Irina |last5=Karimi |first5=Sasan |last6=Pozzi |first6=Federica |last7=Shah |first7=Nilam |last8=Samson |first8=Jacopo |last9=Ajiki |first9=Hiroko |last10=Massa |first10=Lou |last11=Mantzouris |first11=Dimitrios |last12=Karapanagiotis |first12=Ioannis |last13=Cooksey |first13=Christopher |title=The nature of thermochromic effects in dyeings with indigo, 6-bromoindigo, and 6,6′-dibromoindigo, components of Tyrian purple |journal=Dyes and Pigments |date=June 2015 |volume=117 |pages=37–48 |doi=10.1016/j.dyepig.2015.01.025}}</ref> In 1998, by means of a lengthy trial and error process, an English engineer named John Edmonds rediscovered a process for dyeing with Tyrian purple.<ref>{{cite book |first=John |last=Edmonds |title=Tyrian or Imperial Purple: The Mystery of Imperial Purple Dyes |series=Historic Dye Series, no. 7 |location=Little Chalfont, Buckinghamshire, England |publisher=John Edwards |date=2000 |oclc=45315310 |isbn=9780953413362}}</ref><ref>{{cite web |url=http://www.imperial-purple.com/profile.html |title=Author Profile |work=Imperial-Purple.com |access-date=2011-07-13 |url-status=dead |archive-url=https://web.archive.org/web/20110713022226/http://www.imperial-purple.com/profile.html |archive-date=2011-07-13 |df=dmy-all}}</ref> He researched recipes and observations of dyers from the 15th century to the 18th century and explored the biotechnology process behind [[Isatis tinctoria|woad]] fermentation. After collaborating with a chemist, Edmonds hypothesized that an alkaline fermenting vat was necessary. He studied an incomplete ancient recipe for Tyrian purple recorded by Pliny the Elder. By altering the percentage of sea salt in the dye vat and adding [[potash]], he was able to successfully dye wool a deep purple colour.<ref>{{cite book |author=Chenciner, Robert |title=Madder Red: A history of luxury and trade: plant dyes and pigments in world commerce and art |location=Richmond |publisher=Curzon Press |year=2000 |page=295}}</ref> Recent research in [[organic electronics]] has shown that Tyrian purple is an ambipolar organic semiconductor. Transistors and circuits based on this material can be produced from sublimed thin-films of the dye. The good semiconducting properties of the dye originate from strong intermolecular hydrogen bonding that reinforces [[pi stacking]] necessary for transport.<ref>{{cite journal |title=Ambipolar organic field effect transistors and inverters with the natural material Tyrian purple |first1=E.D. |last1=Głowacki |display-authors=etal |journal=AIP Advances |volume=1 |issue=4 |at=042132 |year=2011 |url=http://aipadvances.aip.org/resource/1/aaidbi/v1/i4/p042132_s1|doi=10.1063/1.3660358 |bibcode=2011AIPA....1d2132G |doi-access=free }}</ref> == Modern hue rendering == True Tyrian purple, like most high-[[Colorfulness|chroma]] [[pigment]]s, cannot be accurately rendered on a standard RGB computer monitor. Ancient reports are also not entirely consistent, but these [[wikt:swatch|swatches]] give a rough indication of the likely range in which it appeared: <span style="background-color:#b80049">_________</span> <br> <span style="background-color:#990024">_________</span> The lower one is the [[sRGB]] colour #990024, intended for viewing on an output device with a [[gamma correction|gamma]] of 2.2&nbsp;. It is a representation of [[Royal Horticultural Society|RHS]] colour code 66A,<ref>{{cite web |title=RHS, UCL and RGB Colors, gamma&nbsp;=&nbsp;1.4, fan&nbsp;2 |website=Azalea Society of America |url=http://www.azaleas.org/index.pl/rhsmacfan2.html |access-date=2006-07-15 |url-status=dead |archive-url=https://web.archive.org/web/20070311031344/http://www.azaleas.org/index.pl/rhsmacfan2.html |archive-date=2007-03-11 |df=dmy-all}} (this gives the RGB value #b80049, which has been converted to #990024 for the sRGB gamma of 2.2)</ref> which has been equated to "Tyrian red",<ref>{{cite web |url=http://www.ag.iastate.edu/centers/cad/Eroses.html |author=Buck, G. |title=Buck Rose |page=5 |archive-url=https://web.archive.org/web/20060823170307/http://www.ag.iastate.edu/centers/cad/Eroses.html |archive-date=2006-08-23 |df=dmy-all}}</ref> a term which is often used as a synonym for Tyrian purple. ==Philately== The colour name "Tyrian plum" is popularly given to a [[Edward VII 2d Tyrian plum|British postage stamp]] that was prepared, but never released to the public, shortly before the death of King Edward&nbsp;VII in 1910.<ref>{{cite web |url=http://catalogue.postalmuseum.org/collections/getrecord/GB813_P_150_02_01_21 |website=Postal Museum |series=Collection catalog |title=Edward VII 2d}}</ref> ==Gallery== <gallery widths="190px" heights="180px"> File:Cuneiform tablet BM62788.jpg|alt=cuneiform tablet|[[Cuneiform]] tablet, dated 600–500&nbsp;BCE, with instructions for dyeing wool purple and blue. Ref.{{British-Museum-db|BM62788|id=327282}}. File:Contemporary portrayal of a toga picta.jpg| Painting of a man wearing an all-purple ''toga picta'', from an [[Etruscan civilization|Etruscan]] tomb (about 350&nbsp;BCE). File:Compitalia fresco.jpg|Roman men wearing ''togae praetextae'' with reddish-purple stripes during a religious procession (1st&nbsp;century&nbsp;BCE). File:Empress Theodora.jpg|The Empress Theodora, the wife of the Emperor Justinian, dressed in Tyrian purple. (6th&nbsp;century). File:Karl den store krons av leo III.jpg|A medieval depiction of the coronation of the Emperor [[Charlemagne]] in 800&nbsp;CE. The bishops and cardinals wear Tyrian purple, and the Pope wears white. File:Shroud of Charlemagne manufactured in Constantinople 814.jpg|A fragment of the shroud in which the Emperor [[Charlemagne]] was buried in 814&nbsp;CE. It was made of gold and Tyrian purple from Constantinople. File:Peter Paul Rubens - La découverte de la pourpre.JPG|''[[Hercules' Dog Discovers Purple Dye]]'' by [[Peter Paul Rubens]] (1636), [[Musée Bonnat]] File:Tyrian purple on grayscale.jpg|6,6'-dibromoindigo, the major component of Tyrian purple </gallery> == See also == * {{annotated link|Bolinus brandaris|''Bolinus brandaris''}} * {{annotated link|Hexaplex trunculus|''Hexaplex trunculus''}} * {{annotated link|Tekhelet}} * {{annotated link|Indigo dye}} ==Notes== {{notelist}} ==References== {{reflist}} ==External links== * {{cite web |url=http://www.ancient.eu/Tyrian_Purple/ |title=Tyrian Purple |website=Ancient History Encyclopedia}} * {{cite journal |url=http://www.chriscooksey.demon.co.uk/tyrian/cjcbiblio.html |quote=Source of article in author’s ''Bibliography'' page. |first=Chris J. |last=Cooksey |year=1994 |title=Making Tyrian purple |journal=Dyes in History and Archaeology |volume=13 |pages=7–13 (dead link 8 March 2021)}} * {{cite thesis |last1=Guckelsberger |first1=Marianne |title=Purple Murex Dye in Antiquity |date=December 2013 |url=https://skemman.is/bitstream/1946/16925/1/Purple%20Murex%20Dye%20in%20Antiquity.pdf |publisher=University of Iceland}} * {{cite web |url=http://www.thefreelibrary.com/Plicopurpura+pansa+(Gould,+1853)+from+the+Pacific+Coast+of+Mexico+and...-a0118543935 |website=The Free Library |title=Tyrian purple}} * {{cite web |url=http://tekhelet.com/pdf/Jenson-RoyalPurple-1963.pdf |title=Royal Purple of Tyre}} {{Shades of red}} {{Shades of violet}} {{Dyeing}} {{DEFAULTSORT:Tyrian Purple}} [[Category:Animal dyes]] [[Category:Organic pigments]] [[Category:Mollusc products]] [[Category:Organobromides]] [[Category:Halogen-containing natural products]] [[Category:Shades of violet]] [[Category:Byzantine culture]] [[Category:Byzantine clothing]]'