586 DYEING AND CALICO PRINTING.

When thoroughly incorporated add-—

Sulphate of zinc . 20 lbs.

Stir well in, and add—■

Pipe-clay.10 lbs.

Water. 7J quarts

Nitrate of copper, at 80° Tw. 7J gals.

Mix all thoroughly together.

No. 6. Reserve , Mild (Machine ).—

British gum, dark . 8 lbs.

Water. 3» quarts

Boil, and add—

Soft soap . 2 lbs.

When cool add—

Sulphate of zinc . 6 lbs.

Boiling water . > gal.

Nitrate of copper, at 8o° Tw. 1 quart.

After the reserve paste is printed on, the goods are hung in a somewhat dampatmosphere for forty-eight hours, and then dyed blue in the vat.

For yellow or orange designs upon a blue ground the following pastes are

used as reserves:—

No. 7. Yellow .—

Sulphate of copper.20 lbs.

Water. 2 gals.

Nitrate of lead.20 lbs.

Dissolve, and thicken with—■

Flour .12 lbs.

Sulphate of lead, pulp . 2 gals.

Boil all well together.

N.B. The sulphate of lead here mentioned is the sediment left on makingred liquor with sugar of lead and alum (or sulphate of alumina), after runningoff the clear liquid.

No. 8. Orange .—A standard is made as follows :—

Sugar of lead, white.24 lbs.

Water . 6 gals.

Add litharge. 12 lbs.

Stir the litharge in gradually till it is perfeftly white ; allow the sediment tosubside, and use the clear liquid. This is used instead of the water diredtedin No. 7. After dyeing in the vat, the pieces are passed through sulphuricacid sours, then well washed, and passed for ten minutes through a solutionof bichromate, at 100° F., containing 2 ozs. of this salt per gallon. Thepieces are next well washed in water, and then winced in water and muriaticacid, at i Tw., to which 1 oz. of oxalic acid per gallon has been added. Thistreatment brightens the yellow design, and removes any trace of green thatmay remain. The goods are then washed and dried.