Tags: Chemical Compound, Chemical Substance.
Methyl yellow or C.I. 11020 is a chemical compound which may be used as a pH indicator.In aqueous solution at low pH methyl yellow appears red. Between pH 2.9 and 4.0 methyl yellow undergoes a transition to become yellow above pH 4.0.Additional indicators are listed in the article on pH indicators.It is a possible carcinogen.As butter yellow the agent had been used as a food additive before its toxicity was recognized.
