IUPAC: Sodium 4-[(4-dimethylamino)phenyldiazenyl]benzenesulfonate
Dark orange to yellowish powder.
Transition range pH 3.1 to pH 4.4 (Pink to Orange yellow).
Absorptivity 1%/1cm:
(pH 4.4) at L mx. 468.6 nm: 750 to 850
(pH 3.1) at L mx. 504.2 nm: 1050 to 1150
Dye Content: min 95%
Loss on Drying: max 3% @ 110C.
Transition range acc. ACS: Passes Test
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