Take 1 gallon of water, in which dissolve
4 ounces of binacetate of copper,
1 lib. of sulphate of copper; and thicken this solution with
2 libs. of gum senegal, 1 lib. of British gum, and 4 libs. of pipe-clay.
3. White reserve for the cylinder machine.
Take 11⁄2 gallons of water; in which dissolve
21⁄2 libs. of binacetate of copper,
10 libs. of sulphate of copper; and add to the solution
6 libs. of acetate of lead; then thicken with
10 libs. of gum; adding afterwards 10 libs. of sulphate of lead.
After printing-on this reserve, the goods are to be hung up for two days, then dipped till the proper blue tint be obtained. Finally they must be winced through dilute sulphuric acid to clear up the white, by removing the cupreous tinge.
3. Coloured reserves.
1. Chamois reserve.
Take 1 gallon of the chamois bath ([No. 1.] [page 226], at bottom); to which add
8 ounces of nitrate of copper,
24 ditto of muriate of zinc; thicken with
6 pounds of pipe clay, and 3 libs. of gum senegal.