COLOURS ON WOOLLENS.

9i

Indigo-Blue, part Logwood.

For 100 lbs. of cloth. Colour the cloth in the indigo-blue vat, and rinsewell. Then boil the cloth in a bath of 20 lbs. of alum, 2 lbs. of tartar, 5 lbs.of pensee mordant or purple acid,* for two hours. Remove and cool. To akettle of fresh water add 10 lbs. of logwood in a bag, boiling for half an hour.Cool to 170° F., and enter the wool, boiling half an hour. Cool and rinse.

Purple Blue.

For 100 lbs. of wool. The wool is first coloured lightly in the blue vat.It is then boiled in a solution of 15 lbs. of alum and 3 lbs. of tartar for oneand a half hours. Remove, cool, and drain for twenty-four hours. In akettle of fresh water boil 8 lbs. of cochineal powder for ten minutes. Coolto 170°, and enter the wool for one hour; boil for three quarters of an hour,rinse, and dry.

Chrome Blue.

For 100 lbs. of wool. Boil the wool for one hour in a solution of 3 lbs. ofbichromate of potash, 6 lbs. of alum, 1 lb. of tartar. Remove, cool, andrinse. In a kettle of fresh water boil 6 lbs. of logwood for half an hour, add3 lbs. of dissolved cudbear. Cool to 180 0 F., and enter the wool, boiling andhandling for three quarters of an hour. As chrome colours always darken indrying, the shade, on removal from the bath, must be lighter than that desiredin the finished fabric.

Dark Indigo Blue.

For 100 lbs. of cloth. Boil for one hour and a half in a solution of 20 lbs.of alum, 4 lbs. of tartar, 6 lbs. of pensee mordant, 6 lbs. of extradt of indigo.Remove and cool. Prepare a fresh kettle of 8 to 10 lbs. of logwood, in whichboil the fabric for one hour.

Saxony Blue.

For 100 lbs. of thibet or combed yarn. Dissolve 20 lbs. of alum, 3 lbs. oftartar, 2 lbs. of pensee mordant, 3 lbs. of extradt of indigo, or, better, 1 lb. ofcarmine, in hot water. Cool to 180 0 F.; enter the material, and boil until thecolour becomes even. Too long boiling should be obviated by well andquickly handling.

It is necessary to handle coarse carpet-yarn through a beck heated to 170° F.,and containing 15 lbs. of alum, 10 lbs. of sulphuric acid, 4 lbs. of chemicpaste or sulphate of indigo.f Under the influence of sulphur the colourbecomes of a stone-green shade, but is restored by rinsing in water.

Fast Prussian Blue.

For 100 lbs. of wool or flannel. Dissolve 8 lbs. of red prussiate of potash(ferricyanide of potassium), 2 lbs. of tartaric acid, 2 lbs. of oxalic acid, andthe following mordant in water heated to 208° F., in which the goods are to

* This mordant can be prepared by mixing in a stone vessel 5 lbs. of tartar, 5 lbs. of featheredtin, with 25 lbs. of muriatic acid. To this mixture is added 15 lbs. of sulphuric acid diluted with10 lbs. of water; then very slowly 2 lbs. of nitric acid.

t Sulphate of indigo may be roughly prepared thus:—To 30 lbs. of sulphuric acid (67° B.),add slowly 10 lbs. of pulverised fine Bengal indigo, Stir until all is well mixed. After twodays add slowly 10 lbs. of water.