Modern American tanning; a practical treatise on the manufacture of leather by Unknown

Author:Unknown
Language: eng
Format: epub
Tags: Tanning, Leather
Publisher: Chicago, Jacobsen publishing company
Published: 1902-03-25T05:00:00+00:00

over night. Stir it occasionally every few hours, so that the oil will unite with the gtim.

Now add 2 pounds of glue and i pound of nigrosine B., which should have been dissolved in 2 gallons of water. Now add this mixture together and you will have 11 gallons of material. It might be well to cook the glue alone first before adding it to the gum. Some people also cook the nigrosine by itself. If the stuff is not well cut the leather is liable to have a sandy feel.

Use ^ pint of glycerine to every 2 gallons of finish. No ammonia or soda is necessary. The finish should be applied in a warm room— 80 degrees—^by one man with a sponge. It should be well rubbed in. Use more glycerine if the leather is inclined to spew.

If a brighter finish is needed add a few ounces of albumen to every 3 gallons, but do not cook. Orange shellac can be employed in place of the albumen. This you can keep hot if needed.

FINISHING CHROME AND RUSSIA LEATHER.

To color leather blue or purple on the flesh side before it is dyed black on the grain gives it a distinctive appearance and helps in getting a good color upon the grain. Upon calf, goat, sheep and kangaroo skins the following methods of flesh coloring have been found to be of great value. When the skins come from the tanning liquors wash them thoroughly, press them or strike them out and shave them in the usual manner.

MORDANTING.

Then prepare a mordanting liquor by using for 3,000 pounds of leather, weighed after shaving, 3 gallons of palmetto extract and i pint of glycerine in water at a temperature of 85 or 90 degrees. Drum the skins in this liquor for twenty minutes, then dye the flesh with either purple aniline, blue nigrosine, or a solution of logwood and salsoda or borax.

PURPLE ANILINE.

When purple aniline is used about 3 ounces may be used for each dozen skins, and prepared for use by boiling in 2 gallons of water. Drum the skins in this liquor for twenty minutes, then press them and pass them, folded grain side out, through logwood and striker, wash them off and apply to the grain a fast black aniline, strike out skins and proceed to finish in the usual way.

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BLUE NIGROSINE.

When blue nigrosine is used, use 3 ounces for each dozen skins, and apply in the same manner as above. When powdered logwood is used about I pound of the same, with 2 or 3 ounces of borax or salsoda, boiled in ten gallons of water and used at a temperature of 120 degrees, produce good results.

FAT LIQUOR.

After staining the leather may be fatliquored and grain blacked. The use of the tanning extract serves as a mordant and thereby improves the color, and also makes the grain more solid and less liable to peel. Gambier may be used in the same manner, but it costs more than palmetto. The latter article is somewhat new to tanners, but its good qualities are being fast found out.

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