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100 per cent 25 per cent average thickness barium sulphate buffalo hides cent Per cent CHEMICAL TESTS chrome and vegetable chrome Filled chrome chrome process chrome sole leather chrome tanned leather chrome tanned sole chrome Vegetable Filled chromic oxide chromium combined tannin comparison difference dry leather filled chrome leathers filled chrome sole Filled chrome Vegetable filled leathers filled with paraffin filling materials firmness frayed glucose hide substance hygroscopic irons leather filled leather from three leather in series leathers tested longer wear material combined natural and filled Natural chrome Filled natural chrome leather process of tanning pyroxylin relative humidity scries secure shoe shown in Figure skived soles cut soles were cut steer hide bends Table tannage tanned sole leather tested in series three chrome tanned treated leather vege vegetable and chrome Vegetable Filled chrome Vegetable Natural chrome vegetable process vegetable tanned sole water resistant WEAR TESTS wearing quality