574

DYEING AND CALICO PRINTING.

No. 61. Chrome Standard (Muriate or Chloride ).—

Boiling water .. ,. 2 gals.

Bichromate. 8 lbs.

When dissolved add—

Hydrochloric acid at 32° Tw. i§ gals.

And by degrees—■

Sugar . 3j lbs.

No. 62. Chrome Standard ( Arseniate ).—

Water . 2 gals.

Bichrome . 10 lbs.

Arsenious acid (white arsenic) . 14 lbs.

Hydrochloric (muriatic) acid, at 32° Tw. 1} gals.

Heat till the bichrome is entirely reduced and the liquid is a pure green with-out an olive cast. Sometimes a further amount of acid is required to producethis result. When the redudtion is accomplished the mixture is concentratedto g5° Tw. The chrome standards require care in their preparation; if notperfe&ly uniform and smooth they should be re-heated, and a little more acidadded, if needful. Gum tragacanth is the best thickening material.

For a variety of “ covers,” see Style III., Reserves.

No. 63. Fast Blue Standard .—■

Water .100 gals.

Indigo (wet-ground). 12 lbs.

Copperas . 16 „

Lime, slaked. 18J „

The whole is let stand for two days, and stirred from time to time; thenallowed to settle, and the clear liquor syphoned off is mixed with 1 pint doublemuriate of tin, at 120° Tw., to every 10 gals. It is then thrown upon a flannelstrainer, and allowed to drain till it takes the consistence of a thick paste.

No. 64. Fast Blue (Machine ).—

No. 63 . 1 quart.

Tin crystals. 6 ozs.

Water . 3 quarts.

No. 65. Fast Blue Standard .—•

Indigo, ground wet . 8 lbs.

Caustic soda, at 70° Tw. ij gals.

Water. ij „

Feathered tin, an excess.

Boil in an iron pan until a few drops, when placed on a pane of glass, appear

perfedlly yellow.

No. 66. Fast Blue (Block ).—

No. 65. 1 quart.

Tin crystals. I2 ozs.

Lime-juice, at 6o° F.12 ,,

Gum Senegal water, at 6 lbs. per gal. 3 quarts.