Practical Magazine 13, 1876
(Chemistry applied to the Arts, Manufactures, &c. Dyeing, Calico Printing, Bleaching, Tanning, and Allied Subjects.)
This well-known useful blacking for leather may be made thus: Dissolve 22 lbs. of green vitriol and 5 lbs. of tartaric acid in 9 gallons of water. After the settling, draw off the clear liquid ; then boil 16 lbs. of logwood with about 18 gallons of water and 11 gallons of the fluid. Let the boiled mixture stand for about eight days, pour it off from the sediment, dissolve in it 2 lbs. of grape sugar, and mix this liquid with the green vitriol solution. The blacking so obtained may be made still brighter by mixing the logwood decoction with 4 lbs. of aniline black-blue before the addition of the vitriol. The application of the blacking is very simple. The leather is first well brushed with a solution of soda, or still better with spirit of sal-ammoniac, in twenty-five times as much water, to get rid of the grease. The blacking is then applied with the proper brush for the purpose.
- Stummer's Ingenieur, Dec. 17, 1875.
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