SPECIFICATIONS

ORANGE IV C.I.13080

Synonyms:			4-(4-Anilinophenylazo)benzenesulfonic acid sodium
				Salt, indicator grade, Tropaeolin O

Chemical Formula:			C18H14N3O3SNa

Formula Weight:			375.39

C.A.S.:				554-73-4

Appearance:				Yellowish Brown to Orange powder.

Identification (FTIR):		To conform to standard.

Dye Content:			65% minimum

Absorptivity 1%/1 cm		600 minimum
(water, at λ max. 442 nm)

Loss on drying:			5% maximum

Solubility: 0.1% (DI Water:	Almost Clear Solution

Visual Transition Interval:	From	pH 1.4 (red)
To	pH 2.6 (yellow)	

Effective: 08/15/17