CALICO-PRINTING.

235

This topical black forms a fast color, and resists the fine blue vat, weak potash ley,bichromate of potash, boiling milk of lime, dunging, and maddering.

The preceding answers best for the block; the following for the cylinder,—

2. Take 1 gallon decoction of galls of spec. gray. T056.

18 ounces of flour, mix, boil into a paste, to which, when cool, add8 ounces of the aceto-nitrate ofiron of the preceding formula, and

1 quart of iron liquor of spec. grav. T110.

In Lancashire a little prussiate of potash is sometimes added to nitrate of iron anddecoction of logwood; and the goods are after washing, &c. finished by passing througha weak solution of bichromate of potash. The chromic acid gives depth and permanence1° the black dye, being supposed to impart oxygen to the iron, while it does not aflfeeta ny of the other colors that may happen to be impressed upon the cloth, as solution ofchloride of lime would be apt to do. The solution of the bichromate deepens the spiritPurples into blacks, and therefore with such delicate dyes becomes a very valuable appli-cation. This interesting fact was communicated to me by an eminent calico-printer inLancashire .

Having premised the composition of the topical black dye, we are now prepared toapply it in the lazulite style.

^ !• Black resist.

^ a ke 1 gallon of the above black without the flour,

2 ounces of sulphate of copper,

1 ounce of muriate of ammonia, dissolve and thicken with4 pounds of pipe-clay and 2 pounds of gum.

rp Another good formula is the following:—a he 1 gallon of iron liquor of 1*056 spec. grav.; dissolve in it,

2 ounces of binacetate of copper,

8 ounces of sulphate of copper; and thicken as just described.

Puce reserve paste, contains acetate of alumina mixed with the iron liquor.rpY Full red reserve .,

a he 1 gallon of acetate of alumina, (made with 50 gallons water, 100 lbs. alum, 10 lbs.soda crystals, and 100 lbs. acetate of lead; the supernatant liquid being of spec,grav. 1*085;) dissolve in it4 ounces of corrosive sublimate ; thicken with2 pounds of gum Senegal ,

. 4 pounds of pipe-clay, and mix in 8 ounces of gallipoli oil.q* v* R&serve paste for a ligkt red.

Ke 1 gallon of the weaker sulpho-acetate of alumina formerly prescribed; dissolve in it4 ounces of corrosive sublimate; and thicken with4 pounds of pipe-clay, and 2 pounds of gum; adding to the mixture5 ^. 0Unces of oil.

*^k Tes ist paste.

e I**™ °f water > which dissolve,lbs. of binarseniate of potash, and12 ounces of corrosive sublimate ; thicken withg d lbs. of gum, and 6 lbs. of pipe-clay, adding to the paste 16 ounces of oil.

TakV iiV mlit z reserve paste.

1 half gallon of acetate of alumina, spec. grav. 1*014; (see second aluminous mor-dant, p. 230.)

half gallon iron liquor of spec. grav. 1*027; dissolve in them4 ounces of sulphate of copper, 4 ounces of verdigris, and 1 ounce of nitrate of cop-Por; thicken with

2 bs. of gum,

7 AT 1 , ■ of PTe-clay.

Take ] 'r, 0 ' rese rve paste.

gallon of water; dissolve in it,ounces of binarseniate of potash, andounces of corrosive sublimate; thicken with

3 bs. °f gum,

lbs. of pipe-clay,

To ex 1 Z; ° f0il *

c ° es are^nr^ 11 the manipulation of the lazulite style, we shall suppose that the cali-P mted with the following reserves, taken in their order :—

1. Black reserve, No. 1. above.

2. Full red reserve, No. 3.

3* Bight red reserve, No. 4.

Tour dav <5 • • 4 * ^ eutra ^ reserve, No. 7.

er printing-on these reserves, the goods must be twice dipped in the blue