Applied chemistry : in manufactures, arts, and domestic economy / edited by Edward Andrew Parnell.

  • Parnell, Edward A. (Edward Andrew)
Date:
1844
Catalogue details

Licence: Public Domain Mark

Credit: Applied chemistry : in manufactures, arts, and domestic economy / edited by Edward Andrew Parnell. Source: Wellcome Collection.

Provider: This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)

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    7. Wincing in a solution of bichromate of potash, containing five ounces of the bichromate per piece of calico; 8. Wincing in dilute muriatic acid ; 9. Washing in water. To obtain a figure of chrome-orange instead of chrome-yellow, the calico may be first treated as above, and afterward winced in hot milk of lime to convert the chrome-yellow into chrome-orange. To procure a design in yellow and light blue on a dark blue ground, the cloth is submitted to the following operations:— 1. It is first printed with tbe mixture of sulphate of copper and salts of lead for chrome-yellow, and on the parts to be light blue with a mixture of sulphate of copper and acetate of copper, formed by mixing solutions of acetate of lead and sulphate of copper, allowing the mixture to settle and decanting the supernatant liquid ; 2. After being dried, the cloth is dipped into the blue-vat for the dark ground; 3. It is next passed through dilute sulphuric acid to clear the whites Of the suboxide of copper, and washed in water ; 4. After being winced in a mixed solution of carbonate of soda and car- bonate of ammonia, it is dipped a second time into the blue-vat for the light blue of the figure, and th^i washed in water; 5. It is afterward winced in a solution of bichromate of potash, and then drawn through a cistern containing a solution of one ounce of oxalic acid and one ounce of sulphuric acid to the gallon of water. A pattern comprising a figure of iron buff on a ground of indigo may be applied to cloth by a similar combination of the padding and resist styles, the cupreous resist being mixed with a salt of the peroxide of iron. After the ground of indigo is applied, the cloth is slightly washed, and then winced in a warm dilute solution of carbonate of soda to precipitate hydrated oxide of iron. A buff figure on a dark green ground is sometimes produced by first printing the cloth with the white resist No. 1 (page 160), then dipping into the blue-vat, and after the cloth is cleared and dried, padding it with buff- liquor, and raising the buff by carbonate of soda* Another method of producing a colored figure on the indigo ground, is by combining with the resist paste a mordant for a vegetable coloring matter, to be applied by the madder style, after the cloth has been dipped into the indi- go-vat. This kind of work, which is susceptible of a great variety of modi- fications, is distinguished as the lapis or lazulite style, from the resemblance of the calico thus printed and dyed to the mineral lapis lazuli. It is also known as the neutral style. To obtain a red figure on the indigo ground, the cloth is printed with a resist paste composed, essentially, of red liquor, sulphate of zinc, and acetate of copper. This resist may be made of the following materials, mixed in the order in which they are placed:— No. 1. 2 gallons of boiling water, 6 pounds of alum,' 4 pounds of crude acetate of lead, 4 ounces of chalk, added in small quantities at a time, and 6 ounces of sulphate of zinc. These materials having been thoroughly incorporated, the mixture is allowed to settle, and the clear supernatant liquid is decanted and mixed with acetate of copper and gum-senegal, thus :— No. 2. 1 gallon of the above clear liquid, 3 ounces of acetate of copper, 18 ounces of gum-senegal, 5 pounds of pipe-clay, ,...'- 4 ounces of soft soap, and a little ground indigo for « sightening.