STEAM COLOURS. 601

No. 2. Another Black.

Logwood liquor, at 6° Tw. I gal.

Starch . ij lbs.

Boil, and add whilst still hot—

Copperas. 5 ozs.

Stir thoroughly, and when the mixture is almost cold add—

Gallipoli oil . 2 ozs.

Nitrate of iron, “ well killed ” . 10 „

No. 2 a . Black .—

Logwood liquor, at 12° Tw. 1 gal.

Gall liquor, at 9 0 Tw. 1 quart.

Red liquor, at 20“ Tw. 1 ,,

Iron liquor, at 24° Tw. 1 ,,

Acetic acid . 1 ,,

Thicken with—

Wheat flour. 3 lbs.

Starch . i lb.

Boil, and add—

Gallipoli oil. 1 pint

Oil of turpentine. 1 ,,

This colour is useful either for steaming, raising through soda and washing offin water, or for a black to work with garancin or alizarin purple to go throughthe dye-beck.

No. 3. Blue, for Cylinder, Dark .—

Water. 7 g aIs -

Starch. 14 lbs.

Sal-ammoniac. 2j ,,

Boil these ingredients, and whilst hot add—

Yellow prussiate, ground . 12 lbs.

Red prussiate. G ,,

Tartaric acid . 6 „

When the mixture is nearly cold add—

Sulphuric acid, at full strength. 1 lb.

Oxalic acid (previously dissolved in 2 lbs. hot water) 2 lbs.

Tin pulp (see below) .. •• 6 gals.

The tin pulp just mentioned is prepared as follows :—Take the strongestdouble muriate of tin (solution of protochloride of tin), and add_gs muchsolution of yellow prussiate as will throw down all the tin as a ferrocyanide.This precipitate is washed in pure water by decantation, and drained on afilter till it becomes a stiff paste.

No. 4. Another Dark Blue .—

Water. 8 quarts

Yellow prussiate . 4 lbs.

British gum (pale). 3 >1