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Samples of chestnut and quebracho leathers containing from 0.01 to 0.78 per~ cent of copper or iron, were aged in an atmosphere of oxygen at 100 Ib/in.2 for 7 days at 100° C. The amounts of the nitrogenous materials extractable after this treatment were used as a measure of deterioration. All leathers containing added copper showed more deterioration than the corresponding untreated leathers. In the case of iron, no appreciable increase in the rate of deterioration occurred for values above pH 3.5, and below this value the deterioration appears to be a func~ tion of pH rather than of iron content. For equal amounts of metal, that added as the sulfate is more active in accelerating the deterioration of the leathers than that added in the form of the acetate or the lactate. CONTENTS Page J. Introduction    ____  849 II. Materials and methods  ____  850 III. Results and discussion _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 851 k JE~e~~~fg:~pp~~ ~~it~ -~~ -th~-d~t~ri~~~ti~~ -~r' le-ath~~ = = = = = = = = = = = ~~~ 3. Effect of iron salts on the deterioration of leather _ _ _ _ _ _ _ _ _ _ _ _ _ 854 4. General discussion _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 854 IV. Summary    856 V. References  • ___  857

Influence of copper and iron salts on the behavior of leather in the oxygen bomb