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ruficoccin
ruficoccin n.
Brit. 
/ˌruːfɪˈkɒksɪn/
, /ˌruːfɪˈkɒksɪn/U.S. /ˌrufəˈkɑksən/
[ < rufi- comb. form + coccin n., after German Ruficoccin (C. Liebermann & W. A. van Dorp 1871, in Berichte der Deutsch. Chem. Ges. 4 656)] now rare a red-brown substance obtained by heating carminic acid, said to have the formula C16H10O6./ˌrufəˈkɑksən/ΚΠ
1871 Jrnl. Chem. Soc. 24 913 This new colouring matter. which the authors call ruficoccin, is very sparingly soluble in cold water.
1892 A. Collin & W. Richardson tr. R. Nietzki Chem. Org. Dye-stuffs xv. 267 Ruficoccin is a brick-red powder, sparingly soluble in water and ether, easily soluble in alcohol.
1919 Color Trade Jrnl. Feb. 40/2 When carminic acid is heated to 390°F with water or with dilute hydrochloric acid,..an insoluble red product known as rufi-carmine or ruficoccin, is formed.
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