ALIZARIN RED S, Cas no 130-22-3, Nile Chemicals dyes

Structural formula	Alizarin red S
C.A.S No.	130-22-3
C.I. number	58005
Appearance	Brownish Yellow Powder
Transition Range	pH 4.3 to pH 6.3
	Brilliant Yellow to Pink
	pH 9.4 to pH 12
Solubility in 0.1% (dist water)	Clear Solution
Absorptivity 1% 1 cm
pH ( 6.3 ) Lamda Max 421.5 nm	150
pH ( 9.4 ) Lamda Max 525.5 nm	288
Loss on drying	3.58 %