Mood ring
A mood ring is a finger ring that contains a thermochromic element, or "mood stone", that changes colors based on the temperature of the finger of the wearer. Finger temperature, as long as the ambient temperature is relatively constant, is significantly determined by peripheral blood flow, which is modulated by the autonomic nervous system. A mood ring contains liquid crystals which change color depending on the temperature.[1]
Properties
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The original mood stone was a quartz crystal oval cabochon treated with heat sensitive (thermochromic) liquid crystal material. The mood stone ring was made of sterling silver or vermeil (gold-gilded sterling), whereas the majority of mood rings used base metals, such as copper. Changes in peripheral blood flow (thus finger temperature) caused the liquid crystal to reflect different wavelengths of light, which change the color of the stone. The liquid crystal used in the original mood stone ring was engineered to display a range of seven distinct colours spanning a 20 °F (11 °C) temperature range. A black stone indicated cold hands. As finger temperature warmed, with more blood flowing to the extremities, the mood stone's colour progressed from brown through yellow, light green, dark green and light blue to dark blue.
See also
References
- ^ Marechal, Catherine; et al. (2019). "Survey on AI-Based Multimodal Methods for Emotion Detection". In Kołodziej, Joanna; González-Vélez, Horacio (eds.). High-Performance Modelling and Simulation for Big Data Applications. p. 308. ISBN 978-3-030-16272-6.