1. Black resist.
Take 1 gallon of the above black without the flour,
2 ounces of sulphate of copper,
1 ounce of muriate of ammonia, dissolve and thicken with
4 pounds of pipe-clay and 2 pounds of gum.
Another good formula is the following:—
Take 1 gallon of iron liquor of 1·056 spec. grav. dissolve in it,
2 ounces of binacetate of copper,
8 ounces of sulphate of copper; and thicken as just described.
2. Puce reserve paste, contains acetate of alumina mixed with the iron liquor.
3. Full red reserve.
Take 1 gallon of acetate of alumina, (made with 50 gallons water, 100 libs. alum, 10 libs.
soda crystals, and 100 libs. acetate of lead; the supernatant liquid being of spec. grav. 1·085); dissolve in it
4 ounces of corrosive sublimate; thicken with
2 pounds of gum senegal,
4 pounds of pipe-clay, and mix in 8 ounces of gallipoli oil.