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Cinnabar has a mean refractive index near 3.2, a hardness between 2.0 and 2.5, and a specific gravity of approximately 8.1. The color and properties derive from a structure that is a hexagonal crystalline lattice belonging to the trigonal crystal system , crystals that sometimes exhibit twinning .
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In 1835, "Chinese vermilion" was described as a cinnabar so pure that it only had to be ground into powder to become a perfect vermilion. Historically, European vermilion often included adulterants including brick, orpiment , iron oxide , Persian red , iodine scarlet —and minium (red lead), an inexpensive and bright, but fugitive lead-oxide ...
Vermilion powder (銀朱粉). Essentially, a synthetic form of mercury sulfide, more brilliant than traditional vermilion made from ground cinnabar. Eosin red cake (曙紅膏). Basic herbal colour. It is now used in replacement of traditional carmine. Carmine powder (洋紅粉). Very expensive, it is now replaced with substitutes.
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Cinnabar has been used in Traditional Chinese medicine as a sedative for more than 2000 years, and has been shown to have sedative and toxic effects in mice. [111] In addition to being used for insomnia, cinnabar is thought to be effective for cold sores, sore throat, and some skin infections. [112]
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The turmeric powder becomes red when mixed with lime juice or lime powder. [4] Unlike red lead and vermilion, these are not poisonous. [4] [5] Modern material being sold as sindoor mainly uses vermilion, an orange-red pigment, the purified and powdered form of cinnabar, which is the chief form in which mercury sulfide naturally occurs. As with ...