murex an (mureksan)

[L. murex + -an.] The purpuric acid of Prout (C4H3. NH2.N2O3). It is a product of the decomposition of murex ide. murexide (mü'rek-sid or -sīd), n. [L. murex, the purple-fish, + -ide2.] The purpurate of ammonia of Prout (probably C8H8N606). It crystallizes in four-sided prisms, two faces of which reflect a green metallic luster. The crystals are transparent, and 3901 by transmitted light are of a garnet-red color. It forms a brownish-red powder, and is soluble in caustic potash, the solution having a beautiful purple color. In 1855 and 1856 this substance was largely used as a dye for producing pinks, purples, and reds, but the introduction of aniline colors put an end to its use.