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Found on
http://en.wikipedia.org/wiki/Butter_Yellow

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) ...
Found on
http://www.encyclo.co.uk/local/20973

Type: Term Pronunciation: bŭt′er yel′ō Definitions: 1. 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). Synonyms: dimethylaminoazobenzene, methyl yellow
Found on
http://www.medilexicon.com/medicaldictionary.php?t=13090
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