2. The rougie, or finishing dye.—The bouillon bath is emptied, and replaced with water for the rougie. When it is on the point of boiling, 51⁄2 pounds of cochineal in fine powder are to be thrown in, and mixed with care; when the crust, which forms upon the surface, opens of itself in several places, 14 pounds of solution of tin (as above) are to be added. Should the liquor be likely to boil over the edges of the kettle, it must be refreshed with a little cold water. When the bath has become uniform, the cloth is to be put in, taking care to wince it briskly for two or three turns; then to boil it bodily for an hour, thrusting it under the liquor with a rod whenever it rises to the surface. It is lastly taken out, aired, washed at the river, and dried.

As no person has done more for the improvement of the scarlet dyes than Poërner, I shall here give his processes in detail.

Bouillon, or colouring.—For every pound of cloth or wool, take 14 drams of cream of tartar. When the bath is boiling, and the tartar all dissolved, pour in successively 14 drams of solution of tin, (Mordant F, [Tin],) and let the whole boil together during a few minutes. Now introduce the cloth, and boil it for 2 hours; then take it out, and let it drain and cool.

Rougie, or dye.—For every pound of woollen stuff, take 2 drams of cream of tartar. When the bath begins to boil, add 1 ounce of cochineal reduced to fine powder, stir the mixture well with a rod of willow or any white wood, and let it boil for a few minutes. Then pour in, by successive portions, 1 ounce of solution of tin (Mordant F), stirring continually with the rod. Lastly, dye as quickly as possible. The colour will be a beautiful scarlet.

Second scarlet process of Poërner, the bouillon being the same as above given, and always estimated for 1 pound of cloth or wool. Rougie.—Take one ounce of cochineal in fine powder, and two ounces of solution of tin without tartar.

Third scarlet process of Poërner; the bouillon being as above. Rougie for a pound of cloth.—Take two drams of cream of tartar, one ounce of cochineal, one ounce of solution of tin, and two ounces of sea salt: dye as in process 1. The salt helps the dye to penetrate into the cloth.

Tables of the Composition of the Bouillon and Rougie, by different Authors, for 100 pounds of Cloth or Wool.

Composition of the Bouillon.

Names of the
Authors.		Starch.Cream of
Tartar.		Cochi-
neal.		Solution
of Tin.		Common
Salt.
lb.oz.lb.oz.lb.dr.lb.oz.lb.oz.
Berthollet0060805000
Hellot0012818612800
Scheffer96961249600
Poërner00101500101500