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To Dye Aniline Yellow

This color is slightly soluble in water, and for dyers' use may be used directly for the presive passages through a solution of nitrate or paration of the dye bath. It is, however, acetate of lead, then through a hot one of preferably prepared in a liquid state, by dissulphate of soda; and lastly through a cold solving 1 pound of dye in 2 gallons of alcohol. bath of from 5 to 20 grammes (77 to 300 grains) (Sce No. 2575.) Without any addition to the bichromate of potash to the litre (216 pints) dye bath very good yellows may be produced, of water. but the color is much improved and bright- 2575. To Prepare Magenta for Dye-ened by a trace of sulphuric acid. The ing. This color, which is also called rosein, temperature of the bath should be under fuchsine, and aniline red, is the best known of 2005 Fahr. the series. It is better adapted for the pre- 2580. Schiff's Aniline Yellow. This paration of a liquid dye than any other. In matter, according to Schiff, is easily prepared the hands of the amateur it can be used with by means of hydrated antimonic or stannic economy, and the results obtained are gener- acid. Stannate of soda or other alkaline antially satisfactory. It is readily soluble in alco- moniate or stannate is to be pounded with hol, and to some extent in water. The latter half its weight of aniline to a clear pulpy property is taken advantage of by dyers, the consistence, then hydrochloric acid is added dve bath being prepared directly from the till the acid reaction takes place. It is then crystals. It is, however, preferable to use alcohol for dissolving the color, as the soluility in water is not always the same with different samples. To 1 pound of the crystals is allowed to evaporate spontaneously, and in all 24 gallons of spirit .8200 specific gravity.

The solution may be conveniently made in an ordinary 5-gallon tin. Agitate frequently, and add 2½ gallons of hot water. This product will be suitable for sale as a liquid dye, but for dyers' use, where a large quantity of water is admissable, 1½ gallons of spirit will be found sufficient. It is sometimes necessary to filter before using. shaken up, and the scarlet color removed by etherized alcohol, the mass being, of course, previously dried. After proper purification it this way are formed flakes of a hydrochlorate, having for base a red coloring matter, which must not be confounded with rosaniline.

When this hydrochlorate is decomposed by alkalies, deep yellow flakes are deposited, which again become red in presence of acids.

By impregnating silk or wool with this red color, and then passing it into a hot solution of carbonate of soda, a beautiful yellow tint