
Murexide (NH4C8H4N5O6, or C8H5N5O6·NH3), also called ammonium purpurate or MX, is the ammonium salt of purpuric acid. It may be prepared by heating alloxantin in ammonia gas to 100 °C, or by boiling uramil (5-aminobarbituric acid) with mercury oxide. W.N. Hartley found considerable difficulty in obtaining specimens of murexide sufficiently pure ...
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• (n.) A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. Formerly called also ammonium purpurate.
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<chemistry> A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. Formerly ... Synonym: ammonium purpurate. ... Origin: L. Murex the purple fish, purple. ... Source: Websters ...
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http://www.encyclo.co.uk/local/20973
Mu·rex'ide noun [ Latin
murex the purple fish, purple.]
(Chemistry) A crystalline nitrogenous substance having a splendid dichroism, being green by reflected light and garnet-red by transmitted light. It was formerly used in dyeing calico, and was obtained in a large quantities from guano. ...
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http://www.encyclo.co.uk/webster/M/117

Type: Term Pronunciation: mū-rek′sīd, -sid Definitions: 1. The ammonium salt of purpuric acid, formerly used as a dye but superseded by the aniline colors.
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a reddish-purple, crystalline, sparingly water-soluble solid, CHNO, having a green luster, formerly used as a dye. Also called
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