Indigo Carmine

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indigo carmine [′in·də·gō ′kär·mən]

(organic chemistry)

C₁₆H₈N₂Na₂O₈S₂A dark blue powder with coppery luster; used as a dye in testing kidney function and as a reagent in detecting chlorate and nitrate. Also known as soluble indigo blue.

Indigo Carmine

the disodium salt of indigo-5, 5’-disul-fonic acid, derived by sulfonating indigo. Readily soluble in water, it is used to make inks and food colors and as a chemical indicator. Indigo carmine is not used as a textile dye because of its poor resistance to light.

REFERENCE

Kogan, I. M. Khimiia krasitelei. Moscow, 1956.

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