One of the mysteries of the English language finally explained.
The acid ammonium salt of purpuric acid, a purple-red crystalline solid used in complexometric titrations; 5,5'-nitrilodibarbituric acid ammonium, C₈H₈N₆O₆. Also (more fully "murexide colour"): the characteristic purple-red colour of this salt.
Mid 19th century; earliest use found in Robert Thomson (1810–1864), medical officer of health. From German Murexid from classical Latin mūrex + German -id.
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