6. Capuchin colour.—Quercitron and cochineal thickened with starch; to the paste add oxalic acid, and perchloride of tin.
7. Annotto orange.—Dissolve the annotto in soda lye, of spec. grav. 1·07, at a boiling heat; add aluminate of soda, and thicken with gum.
8. Golden yellow.—Decoction of Persian berries thickened with starch; to which some alum and muriate of tin are added, with a little perchloride of tin and oxalic acid.
9. Lemon yellow.—Persian berries; starch; alum.
10. An ammoniacal solution of cochineal is used for making many violet and mallow colours. It is prepared by infusing cochineal in water of ammonia for 24 hours; then diluting with water, heating to ebullition, and straining.
11. Fine violet is given by ammoniacal cochineal, with alum and oxalic acid; to which a little aceto-sulphate of indigo is added, and gum for thickening. The following blue may be used instead of the solution of indigo. The mallow tint is given by adding a little perchloride of tin to the above formula, and leaving out the blue.
12. Dark blue.—Soluble Prussian blue; tartaric acid; alum; thicken with gum.
13. Emerald green.—One quart of decoction, equivalent to 1 pound of Persian berries; 1 quart of infusion of quercitron, of spec. grav. 1·027; in which dissolve 12 ounces of alum in powder; and add 6 ounces of the following blue bath for greens; thicken with 20 ounces of gum.
14. Blue bath for greens. Half a gallon of water at 140° F., 1 pound of soluble Prussian blue, 3 ounces of tartaric acid, and 2 ounces of alum.
I. Printing of Silks.—1. Of the madder style. This is one of the most difficult to execute, requiring both much skill and experience. The first step is the removal of the gum. A copper being nearly filled with water, the pieces, tied up in a linen bag, are put into it, with a quarter of a pound of soap for every pound of silk, and are boiled for 3 hours. If the silk be Indian, half an ounce of soda crystals must be added. When the goods are taken out, they are rinsed in the river, then passed through water at 140° F., holding 8 ounces of crystallised soda in solution, as a scourer. They are next rinsed in cold water, and steeped in water very faintly acidulated with sulphuric acid, during 4 hours, then rinsed, and dried.