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Indigo Caromne Dye

Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, also known as indigotine or FD&C Blue #2, is a pH indicator with the chemical formula C16H8N2Na2O8S2. It is approved for use as a food colorant in the United States and in Europe, and has the E number E132.

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CAS:860-22-0
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