Cadmium, I′odide of

CdI 2 . Syn. Hydri′odate of cadmium ; Cad′′mii iodi′dum , C. hydrio′das , L. Prep. (Crookes.) Cadmium in filings 1 part, pure iodine 2 parts, are to be placed together in a capacious flask, with alcohol sufficient to cover them. Action commences at once, attended with considerable evolution of heat; when it ceases, heat the mixture till it is colourle ; then filter from a few grains of cadmium which will remain undi olved, evaporate and crystallise. Uses. In photography this salt has lately been employed with great succe for iodizing collodion. Being very stable, it is not decomposed, and the collodion iodized with it preserves its sensitivene undiminished during many months. (See Collodion .) In medicine it is used occasionally as a substitute for iodide of lead.