out of the melt, 3
Plate XI. Fig. 6.—Morphine 1 : 200.
Crystals formed with Wagner’s reagent (x150).
Wagner’s Reagent. — A very characteristic test, though not so sensitive as the one with Marme’s reagent. A heavy, amorphous precipitate forms reddish-brown drops before crystallization takes place, and from the precipitate crystallization takes place very slowly. ¶ It is often necessary to allow the solution to stand several minutes before crystals are formed. The crystals are large plates, reddish-brown in color, and irregular in outline. Optimum concentration is about 1 : 200.
Charles H. Stephenson. Some Micro-chemical Tests for Alkaloids. Including C. E. Parker, Chemical Tests of the Alkaloids Used. With Twenty-seven Plates (162 Photomicrographs) and a Folding Table of Reactions. London, 1921
10 March 2013
tags: alkaloids; photo micrographs; precipitates; rounds