Toluidine Blue , Cas no 92-31-9

Structural formula	Toluidine blue

	C.I. number	52040
	C.A.S. no.	92-31-9
	Appearance	Dark greenish black powder
	Solubility 0.1 % water	Clear Blue Soln
	Absorptivity 1% 1cm at lamda max 629.0 nm	1312
	Dye Content	86 % (limi t> 80%)
	Loss on drying	6.25 %