Medical Definition of Butter yellow
1.
C6H5N:NC6H4N(CH3)2;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 4.0).
Synonym: dimethylaminoazobenzene, methyl yellow.
(05 Mar 2000)
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