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absorbed acid-ion action actual alkalies alum alumina ammonia animal atoms bacteria bacterium basic salt bating bichromate boots boracic butts calf skins carbon catechol caustic soda cells CHAPTER chemical chloride chrome leathers chromic colloidal colour concentration containing corium degras deliming dilute dissolved drench dried drumming dung edge effect enzymes epidermis excess fermentation fibres flesh formic acid gelatine grain grease hair handlers heat hide hide-fibre hide-substance hydrochloric acid hydrogen hydrolysed hydrolysis ionisation ions keratins kips knife layer leather manufacture less lime liquid liquor machine material method mixture morocco neutralisation oxidation pack pickled precipitate produce Prof puering putrefaction pyrogallol quantities rapidly removed sheep sheepskins slicker soaked sodium soft softening sole-leather soluble solution split substance sufficient sulphate sulphide sulphuric acid sumach surface swelling swollen tannage tanner tannin temperature thick thin treatment unhairing usually valonia warm washing weak acid