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A color circle based on spectral wavelengths appears with red at one end of the spectrum and violet at the other. A wedge-shaped gap represents colors that have no unique spectral frequency. These extra-spectral colors, the purples, form from additive mixture of colors from the ends of the spectrum. White is also an extra-spectral color because it combines the frequencies of every color, which is why as it passes through a prism it is separated into a rainbow. That of course implies that all colors mixed with white like pink or any of the pastels are also extra-spectral colors because they will include wavelengths of every color.
In 1848, Brown published an Assamese grammar, followed by an Assamese translation of the New Testament in 1850. The language regained recognition in part due to Assamese publications edited by him including an Assamese English dictionary and an Assamese grammar book, and his association with Hemchandra Barua who was taught at Brown's school..