226 DYEING' AND CALICO PRINTING.

Boil well, and stir till cold ; then add—

1 lb. acetate of lime, at 29° Tw.;

2 lbs. nitrate of alumina, at 23° Tw.;

3 lbs. hyposulphite of lime, at 13° Tw.

Purple.

3 lbs. alizarin paste (10 per cent) ;

10 quarts purple thickening ;

6 ozs. pyrolignite of lime, at 18 0 Tw.;

12 ozs. acetate of lime, at 25' Tw.

The printed goods are steamed for an hour or two, and then aged for twenty-four to thirty-six hours. They are then padded in the chalk and arseniate ofsoda bath; after which they are washed and soaped in a single soap-bathwithout tin-crystals, and if needful cleared in a weak solution of bleaching-powder.

Thickening for Reds.

12 lbs. wheat starch ;

40 quarts water;

4 quarts acetic acid, at g° Tw.;ij lbs. gum tragacanth ;

2 lbs. olive oil;

Boil well together, and stir till cold.

Thickening for Purple.

10 lbs. starch ;

27 quarts water;

3 quarts acetic acid ;

ij- lbs. gum tragacanth ;

2 lbs. olive oil.

Boil well together, and stir till cold.

The mordants in the above recipes are prepared as follows :—

Acetate of Alumina.

Stir 30 lbs. hydrate of alumina into 6 quarts of acetic acid, warm, filter, andreduce to the specific gravity required.

The hydrate of alumina is prepared by dissolving 72 lbs. alum in 100 gals,water, and 62 lbs. soda in 100 gals, water. The two solutions are mixed, theprecipitate is washed eight times by decantation, colledted on a filter, andpressed. It must be dissolved on the filter before it gets dry.

Nitrate of Alumina.

2 lbs. nitrate of lead;

2 lbs. alum;

2 quarts water.

Dissolve and filter off the liquid from the precipitate, and dilute to properstandard.

The reds are turned more yellow by nitrate than by acetate of alumina, andwhen the former is used more acetate of lime is taken in addition.