Polyphenyl yellow

Remarks. The condensation of the sulfo derivative of p-nitrotoluene was first observed accidentally by Johann Walther, and further investigation of the reaction has shown that different dyes, varying in color from yellow to red, are formed depending on the nature of the reaction. If the condensation is carried out under somewhat more drastic conditions, for example, with more sodium hydroxide and at a liigher temperature, the color of the dye is more greenish. Still more greenish dyes can be obtained by careful oxidation with sodium hypochlorite (sun yellow 3G, polyphenyl yellow 3G). 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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