S P E C I F I C A T I O N S

INDIGO CARMINE CERTIFIED

Synonyms:					C.I. 73015; Acid Blue 74; 
						5,5'-Indigodisulfonic acid, disodium salt

Chemical Formula:						C16H8N2O8S2Na2
Formula Weight:						466.35
CAS No.:							860-22-0
Description:							Dark blue to purple powder
Dye content (dried basis):					80.0%  minimum
Loss on drying:						5.0% maximum
Visual Transition Interval:				From pH 11.5 (Blue) 
								To pH 14.0 (yellow)
Aqueous solubility:					1 g in 100 ml at 25 Deg. C
Subsidiary dyes, excluding disodium 
3,3-dioxo 2,2’-bi-indolylidine-5,7’-disulfonate:		1.00% maximum
Dye intermediates:						0.50% maximum
Arsenic:							8 ppm maximum
Lead:								0.001% maximum
Sulfur:							13.0 – 14.0%
Mercury:							1.00 mg/kg maximum
Cadmium:							1.00 mg/kg maximum
Heavy metals:						40.00 mg/kg maximum
		
LIGHT SENSITIVE

Effective: 10/31/16