murexide
 紫□酸銨; 紅紫酸銨
 mu·rex·ide /mjʊˈrɛkˌsaɪd/ 名詞
 骨螺紫,紅紫酸胺,紅紫酸銨,紫反酸銨
 Mu·rex·ide n.  Chem. A crystalline nitrogenous substance (C8H8N6O6, 5-5'-nitrilodibarbituric acid monoammonium salt) 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.  It is now synthesized from alloxan.  Formerly called also ammonium purpurate.
 ◄ ►