Rose Bengal , Cas no 632-69-9

Structural formula	Rose Bengal

	C.I. number	45440
	C.A.S no.	632-69-9
	Appearance	Dark Red Powder
	Absorptivity 1% ,1 cm water + 1 ml Na₂CO₃ sol at lamda max 541.0 nm	800
	Empirical formula	C₂₀H₂O₅I₄Cl₄Na₂
	Loss on drying	4.63 %