Indigo Carmine Dye (860-22-0)

Indigo Carmine Dye Chemical Structure

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What is Indigo Carmine Dye?

Indigo Carmine or 5,5-indigodisulfonic acid sodium salt is an organic sodium salt formed via formal condensation of indigo carmine (acid form) with two equivalents of sodium hydroxide. It is approved as a colorant to be used in food coloring in the U.S and E.U. to produce a blue color. It has the E number E132.

Macsen Laboratories is the leading manufacturer and supplier of Indigo Carmine dye (food grade) with ISO certification.
PRODUCT SPECIFICATIONS
Name of Product Indigo Carmine Dye
IUPAC Name disodium;2-(3-hydroxy-5-sulfonato-1H-indol-2-yl)-3-oxoindole-5-sulfonate
Synonyms Indigotine; 5,5′-indigodisulfonic acid sodium salt; C.I. Acid Blue 74; C.I. Food Blue 1; Indigotindisulfonate sodium; Amacid Brilliant Blue; índigo carmim; Indaco carminio; Carmin indigo
CAS No 860-22-0
Molecular Formula C16H8N2Na2O8S2
Molecular Weight 466.4 g/mol
Pubchem CID 2723854
Pubchem SID 462768915

CHEMICAL PROPERTIES

SR. No Criteria Limit/Specification
1 Appearance (form) Solid Powder or Granules
2 Appearance (colour) Dusky, purplish-blue
3 Total dye content (On as basis) NLT 85.0 %
4 Loss on Drying (at 135 °C) NMT 15.0 %
5 Water-insoluble matter NMT 0.2 %
6 Combined ether extracts NMT 0.2 %
7 Subsidiary dyes NMT 1.0 %
8 Dye Intermediates NMT 0.5 %
9 Lead NMT 2 ppm
10 Arsenic NMT 3 ppm
11 Mercury NMT 1 ppm
12 Cadmium NMT 1 ppm

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