Appearance Yellow crystals Molar mass 225.289 g/mol | Formula C14H15N3 Melting point 116 °C | |
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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.
Safety
It is a possible carcinogen. As "butter yellow", the agent had been used as a food additive before its toxicity was recognized. The result from consuming such chemicals is tumors on the liver.
References
Methyl yellow Wikipedia(Text) CC BY-SA