Importance

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Abstract

Horny substances are removed from animal hides by a process wherein animal hides are treated in a liquor comprising from 0.05 to 5% by weight, based on the salted weight, of one or more compounds of the formula I or the corresponding alkali metal or alkaline earth metal or ammonium or phosphonium salts thereof, the variables being defined as follows: R.sup.1 is selected from hydrogen and C.sub.1-C.sub.12-alkyl, unsubstituted or substituted by one or more S--H or O--H groups; X.sup.1 to X.sup.4 are identical or different and are selected from hydrogen, C.sub.1-C.sub.4-alkyl, O--H, S--H and N--HR.sup.2, R.sup.2 is hydrogen or C.sub.1-C.sub.12-alkyl or a C.sub.1-C.sub.4-alkyl-C.dbd.O group, at least one of the radicals X.sup.1 to X.sup.4 being S--H, and, if R.sup.1 contains neither O--H nor S--H, at least one further radical from among X.sup.1 to X.sup.4 is selected from S--H, OH and NH--R.sup.2, and furthermore with at least one compound which catalyzes the hydrolysis of peptide bonds.

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First Claim