butter yellow
Pronunciation: bŭt′er yel′ō
Definition: A fat-soluble yellow dye (MW 225) that has hepatic carcinogenic action in experimental animals; used as an indicator of pH (red, at pH 2.9, yellow at pH 4).
Synonym(s): dimethylaminoazobenzene, methyl yellow
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Examples: glitazone, GI cocktail, etc.
