The dye Ethyl Green ( C.I. 42590; C27H35N3ClBr is a triarylmethane dye. It is soluble in water.
Its CAS number is and its SMILES structure is C/(C)=C (C=C3)/C=C\C3=C (C2=CC=C((C) (CC)C)C=C2)/C1=C C=C(N(C)C)C=C1.
Ethyl green is made of crystal violet by adding an ethyl group; crystal violet is therefore a possible contaminant.
Methyl green is a closely related dye used as a stain in histology. Methyl green and ethyl green are very similar and probably interchangeable.
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