Blue No.201

Legal color:	Blue No.201
General name:	Indigo
Class:	Vat Dye
FDA :	D & C Blue No.6
CI #:	C.I. 73000
Color #:	Vat Blue 1
CAS #:	482-89-3
CAS :	：3H-Indol-3-one,2-(1,3-dihydro-3-oxo-2H-indol-2-ylidene)-1,2-dihydro-
IUPAC:	→1;2,2'-Bi(2,3-dihydroxy-3-oxoindolylidene) →2;2,3,2',3'-Tetrahydro-3,3'-dioxo-2,2'-biindolylidene →3;2,3,2',3'-Tetrahydro-3,3'-dioxo-△2,2'-biindolylidene →4;Indigo
Chemical structure :	Indigo