2611. To Dye Silks or Woolens Violet or Purple with Aniline

2611.    To Dye Silks or Woolens Violet or Purple with Aniline. Violets and purples are produced on wool in the same manner as the blue; on silk the same method is used likewise, but the water must only be heated short of boiling. (See Nos. 315 (Mauve for Silk, Wool or Worsted) and 316.)

2612. Jacobson's Method of Combining Fat and Oil with Aniline Bed

2612.     Jacobson's Method of Combining Fat and Oil with Aniline Bed. The following process is given for this purpose by Dr. E. Jacobson. First separate rosaniline from commercial fuchsine by heating with soda or digestion with ammonia; wash and dry it. An oleate or stearate of rosani-line is next obtained by adding the rosaniline to oleic acid or melted stearic acid as long as it will dissolve, or by putting them together in equivalent proportions. An excess of oleic acid must be avoided when the compound is required for a varnish, as it delays the drying. Oleate or stearate of rosaniline easily dissolves in fats or oils, and colors these an intense red. If it is wanted for a linseed oil varnish, the linseed oil must be free from lead. The compound must be kept from the fire, or it soon turns blue, probably by the reducing action of the fatty acids. The best red color is obtained in linseed oil varnish. Stearine with oleate or stearate of rosaniline appears a bluish red. Paraffine appears to act as a reducing agent with the compounds of fatty acids and aniline, and changes to a dirty violet color; the mixture then is inapplicable to the coloring of paraffine or stearine candles. The r oleate or stearate of rosaniline is a good coloring agent for hair oil or pomatum, but, from the instability of the color, seems inapplicable for oil painting.

2613. Dyeing with Fuchsine on Wool or Silk

2613. Dyeing with Fuchsine on Wool or Silk. Fuchsine (the crystals of acetate of rosaniline), or the solution, is mixed with cold water for silk, or in water of 130° to 140° Fahr. for wool, which temperature is kept up. For silk, a few drops of acetic acid are also added. The strength of the dye regulates the quantity which is required. The goods are merely immersed in the bath until they have taken up sufficient of the color; it is not always advisable to work them about while in the bath.

Liquid Colors for Various