Indigo Carmine (C.I. 73015)
Indigo carmine, or 5,5′-indigodisulfonic acid sodium salt, is an organic salt derived from indigo by sulfonation, which renders the compound soluble in water. It is approved for use as a food colourant in the U.S and E.U., It has the E number E132. It is also a pH indicator.
Dyes, Stains & Indicators
|Appearance||dark blue to purple powder|
|Storage Conditions||Room temperature|
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