Neutralization of Hide

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Neutralization of Hide

 

(in technology), reduction of the acidity of leather after tanning with compounds of chromium, aluminum or zirconium, intended to fix the tanning substance with albumin and create favorable conditions for subsequent dyeing of the leather. Before neutralization, the hide is washed with warm water, and the excess acid is then neutralized with weak alkaline reagents (sodium bicarbonate and ammonium sulfate, sodium carbonate and ammonium sulfate). Leather tanned with compounds of zirconium is neutralized with hexamethylenetetramine or sodium sulfite. The waste products of neutralization are removed by subsequent rinsing.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.