Take 1 gallon of lime juice, of spec. grav. 1·085; dissolve in it
3 pounds of tartaric acid, and one pound of oxalic acid; thicken with
6 pounds of gum senegal, or 5 pounds of British gum.
6., 7. A stronger and weaker discharge is made of the same materials; and one is made without the tartaric acid.
Second; combination of discharges with mordants.
1. Black, red, lilac, and white figures upon an olive ground.
The olive being given in a madder bath, and the ground well whitened (see [Madder]), the cloth is padded in a weak buff mordant; and upon the parts that are to remain white, the weakest simple discharge No. 3. is printed-on by the cylinder; (in some works the discharge paste is applied and made dry before padding through the iron liquor;) the goods are cleared of the paste in a tepid chalky water, then dyed in a quercitron bath, containing a little glue, and cleared in a bran bath.
Discharge mordants upon mordants may be regarded as a beautiful modification of the preceding style. Example.
A violet ground or impression, with red and white.
1. Pad with an acetate of iron of 1·004; or print-on with the cylinder, iron liquor of 1·027 thickened with British gum.
2. Print-on a red mordant, strongly acidulated with lime juice of 1·226.