Take 50 gallons of boiling water;
Take 150 pounds of sulphate of iron; dissolve along with
Take 10 pounds of alum; which partly saturate by the gradual addition of
Take 5 pounds of crystals of soda; and in this mixture dissolve
Take 50 pounds of pyrolignous acetate of lead. Allow the whole to settle, and draw off the clear supernatant liquid.
For furniture prints this bath should have the spec. grav. 1·07.
The calico being padded in it, is to be dried in the hot-flue; and after 48 hours suspension is to be washed in water at 170° containing some chalk, by the wince apparatus. It is then washed, by the same apparatus, in hot water, containing a pailful of soda lye of spec. grav. 1·04.
For light tints the padding liquor should be reduced to the spec. grav. 1·01. The dye in either case may be brightened by wincing through a weak solution of chloride of lime.
Nitrate of iron diffused through a body of water may be also used for padding, with alternate washings in water, and a final wincing in a weak alkaline lye.
With a stronger solution, similar to the first, the boot-top colour is given.
2. The bronze or solitaire.
The goods are to be padded in a solution of the sulphate or muriate of manganese, of a strength proportional to the shade desired, dried in the hot-flue, and then raised by wincing them in a boiling-hot caustic lye, of spec. grav. 1·08, and next through a weak solution of chloride of lime, or soda. They are afterwards rinsed. Instead of passing them through the chloride, they may be merely exposed to the air till the manganese attracts oxygen, then rinsed, and dried.
When the manganese solution has the density of 1·027, it gives a light shade; at the density of 1·06, a shade of moderate depth, and at 1·12 a dark tint.
The texture of the stuff is apt to be injured during the oxidation of the manganese.