Schweininger Cure

See Treatment , Meth Schweizer's Reagent. A solution o. Imitated cupnc oxid in ammonia, for use in chemic and phys i laboratories. This reagent is prepared as follows: Oxy hydrate of copper is carefully precipitated from th sulphate by a dilute solution of ammonia; tin green precipitate, separated and washed, is while still moist to strong ammonia, in slightly warming, it is di olved. Upon cooling, tals of sub-sulphate of copper and ammonia fall to th bottom. The filtered liquid contains only th moniacal cupric oxid in solution. It musl be kept in bottles of dark gla , or in the dark. It can a prepared by digesting copper turnings in an open DO tie with liquor ammonii of the Pharmacopeia. A- 1! is very easily decomposed by light, it is perhaps best prepared fresh when required. This reagent has the power of di olving pure cellulose. It is fit for use only so long as it rapidly di olves cotton-wool. This reagent po e es its chief interest from the fact that it is the only liquid known in which cellulose appears to di olve without e ential change composition. It hus a limited application in the crimination of the fibers used in the arts,