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The influence of a synthetic tanning material, sulphite cellulose, and sulphi ted extracts on the deterioration of leather, when used with chestnut and quebracho extracts for tanning, was studied. Leathers tanned with the aid of these materials were treated with varying amounts of sulphu"ic acid and aged under controlled conditions of temperature and relative humidi ty. D eterioration was determined by measuring the change in tensile strength after 6, 12, 18, and 24 months. The amount of extractable nitfLlgen was also determined for the samples aged for 24 months. The results show .ha~ deterioration as measured by tensile strength and chemical decomposition of the hide substance is a function of the pH value of a water extract of the sample rather than the acid content of the leather as measured by the total sulphur or the Procter and Searle method . CONTENTS Page

Influence of some sulphur-containing tanning materials on the deterioration of vegetable-tanned leathers by sulphuric acid