... 27-2 Appearance:yellow to brown powder Type:basic dye Auramine O, also called Basic yellow 2, Pyocatanium aureum, aizen auramine, Pyoktanin ... water and soluble in ethanol. .Specification:Name : Basic Yellow 2(Auramine o) Index No.: basic yellow 2 Appearance : Golden Yellow Even Powder ... ; paper; hemp and viscose . This can be used for coloring basic oil, fat, paint and prepared to colour lake and ink.