92

DYEING AND CALICO PRINTING.

be well handled for one and a half hours. Then remove, allow to drain,rinse, and dry.

The mordant. Add i lb. of feathered tin to io lbs. of nitric acid (36° B.),10 lbs. of hydrochloric acid (22° B.), 10 lbs. of sulphuric acid (66° B.), dilutedwith water.

Some dyers themselves prepare the red prussiate of potash by passingchlorine (obtained by the adtion of sulphuric acid upon manganese and salt)through a leaden pipe into a solution of yellow prussiate of potash. A darkolive liquid is produced, which yields on evaporation crystals of red prussiate.When nitrate of iron no longer produces a blue colouration enough chlorinehas been taken up. The olive liquid can be employed without crystallisation.

Aniline Blue.

For 100 lbs. of fabric. Dissolve lit lbs. of aniline blue in 3 quarts of boilingalcohol. Filter the solution, and add the clear filtrate to a bath of water at130° F., together with 10 lbs. of sulphate of soda, and 5 lbs. of acetic acid.The goods are now to be entered and handled for twenty minutes, when thetemperature of the bath is to be slowly raised to 200° F. At this temperatureadd 5 lbs. of sulphuric acid diluted with water, Boil for twenty minutes,rinse, and dry. The aniline blue should be added in two or three quantitiesin order to render the colouring of equal quality throughout. Closely wovenfabrics, braid, &c., should be prepared in a boiling solution of 10 lbs. ofsulphuric acid and 2 lbs. of tartaric acid before colouring with the aniline.

REDS ON WOOL.

Scarlet.

For 100 lbs. of fabric. Boil for fifteen minutes 11 lbs. of Hondurascochineal, 5 lbs. of tartar, or 3 lbs. of tartaric acid, 2 lbs. of oxalic acid, 1 lb.of tin crystals, ij lbs. of flavine, 10 lbs. of muriate of tin (see footnote, p. 91)Cool to 180" F., and enter the goods, boiling for one hour. Remove, cool, andrinse. 5 lbs. of hydrochloric acid added to the beck will prevent theappearance of undyed filaments of wool, &c. This addition is attended withgood results in all kinds of scarlets, orange, and pinks.

Scarlet (Lac-Dye).

For loo lbs. of flannel or yarn. Boil in water for fifteen minutes 25 lbs. oflac-dye, 13 lbs. of muriate of tin, 5 lbs. of tartar, 1 lb. of flavine (the quantityof which may be varied according to shade), 1 lb. of tin crystals, 5 lbs. ofhydrochloric acid. Cool to 170° F., and enter the goods, boiling for one hour.Rinse whilst hot. This is a faster colour than

Cochineal Scarlet.

For 100 lbs. of fabric. Dissolve in water 10 lbs. of nitrate of tin, 5 lbs.of cream of tartar, and 1 lb. of flavine. Boil the solution for ten minutes,and cool to 170° F. Enter the goods, boiling for one hour. Remove, cool,and rinse.

To a kettle of fresh water add 7 lbs. of cochineal and 2 lbs. of starch insolution. Strain, and then boil for five minutes. Cool to 180 0 , and then add