00823 00025 is referred as INDIGO CARMINE AR under Research Lab Fine Chem Industries catalogue.00823 00025 INDIGO CARMINE AR is an organic salt synthesized by the sulfonation of indigo which makes it to be soluble in water. It is approved as a food colourant in the USA. It is also a pH indicator. 0.2 % aqueous solution of indigo carmine appears blue at 11.4 pH and yellow at 13.0. It is also used as an indicator for dissolved oxygen. It gets converted into isatin-5-sulfonic acid in the presence of ozone and superoxides also. It is also used to dye capsules. It also finds application in obstetric and urologic surgeries to detect amniotic fluid leaks and urinary tract.

Specifications:

INDIGO CARMINE AR (C.I. No. 73015)

Dark blue-violet powder having a metallic luster of copper

Molecular Formula: C16H8N2Na2O8S2

Molecular Weight: 466.35

Absorption maxima in water 608 612 nm Absorptivity (A 1%/ 1cm: @ max; in water; on dried substance) 380 - 475

Loss on drying (105C) <6>

Suitability for microscopy Passes test

CAS No. : 860-22-0

Pack Size: 25gm