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Sulphate of Alumina

Saturate strain. Mix the decoctions, and, while the dilute sulphuric acid with hydrate of alumina; liquid is hot, gradually add 5 troy ounces evaporate and crystallize. finely powdered lime, previously mixed with 2 pints of water, stirring constantly until the with 1 per cent. of salicine, the two firstnamed acids cause a distinct red coloration, which does not ensue with the acid containing nitric acid. This latter acid is not even colored by pure salicine.