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4-Dimethylaminoazobenzene
Introduction
Synonyms and keywords: 4-Dimethylaminoazobenzene, Butter yellow.
Overview
Overview
Methyl yellow, or C.I. 11020, is a chemical compound which may be used as a pH indicator. Template:PH indicator template
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.
As “butter yellow” the agent had been used as a food additive before its toxicity was recognized (Opie EL)
References
References
- Template:PGCH
- Eugene L. Opie. The Pathogenesis of Tumors of the Liver Produced by Butter Yellow. The Journal of Experimental Medicine, Vol 80, 231-246, 1944.
Editor-In-Chief: Template:Chembox new C. Michael Gibson, M.S., M.D. [1]