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Chemique, or Chemic Blue

vitriol, in a glass or earthen vessel, placed in Sulphate of Indigo. To 7 or 8 parts of oil of 2612. Jacobson's Method of Combining Fat and Oil with Aniline Red. cold water, add gradually 1 part of fine indigo The following process is given for this purpose in powder, stirring the mixture at each addiby 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 rosaniline 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 cil 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 olcate or stearate of rosaniline appears a blution with a glass rod or piece of tobacco-pipe. Cover the vessel for 24 hours, then dilute with an equal weight of water. Sometimes it is sold without diluting. The German fuming acid answers best, 4 or 5 parts of it being sufficient for 1 of indigo. For dyeing silk, &c., carbonate of potash, soda, or ammonia, is added, to neutralize the acid, taking care not to add it in excess. (See Nos. 98 and 4791.) 2617. Liefchild's Patent Blue for Linen. Mix 4 parts Chinese blue, 1 of Turnbull's blue, and 1 of oxalic acid; gradually add boiling water until the whole is dissolved, and lastly 4 parts of sulphate of indigo. The latter is made with 1 partindigo, and 4 sulphuric acid, neutralized with carbonate of ammonia. kinds of cake blue consist of indigo and starch. 2618.

Blue for Linen. The ordinary