Kermesic acid
Revision as of 07:07, 24 July 2013 by (username removed)
Description
The primary red colorant found in kermes. Kermesic acid is a water-soluble anthraquinone derivative extracted from the dried bodies of the female kermes insect, Kermes vermilio Planchon, found in southern Europe on the small evergreen kermes oak, Quercus coccifera.
Other Properties
Soluble in hot water, ethyl ether. Slightly soluble in cold water. In sulfuric acid, forms a violet red that turns blue by adding boric acid.
| Composition | C18H12O9 |
|---|
Authority
- The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996
- Judith Hofenk-de Graaff, Natural Dyestuffs: Origin, Chemical Constitution, Identification, Central Research Laboratory for Objects of Art and Science, Amsterdam, 1969