Indigo Carmine(redirected from sodium indigotin disulfonate)
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indigo carmine[′in·də·gō ′kär·mən]
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.