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Aniline Black for Dyeing

According to Mr. Köchlin, aniline black is produced as follows: Water, 20 to 20 parts; chlorate of potassa, 1 part; sal ammoniac, 1 part; chloride of copper, 1 part; aniline, hydrochloric acid, of each 1 part, previously mixed together. Several other formulæ for dyes, since a sumaching with 4 pounds for dyeing purposes. It is essential in each sumach to 20 pounds cotton is of itself a of them, and always, that the preparation sufficient mordanting to fix aniline colors ex- shall be acid, and the more acid it is, the cellently. The application of the phosphate more rapid is the production of the blacks. of lime solution as a mordant for cochineal The action, of course, if it be excessive, will colors upon cotton he also considers as quite be likely to injure the fibre of the fabric. useless.