CHAPTER XII.

_DEPILATION._

Methods of depilation -- Sweating process -- Liming -- Sources of lime -- Quicklime -- Slaking of lime -- Solubility of lime in water -- Analysis of lime -- “Available” lime -- Action of lime on hide -- Liming in pits -- Suspension limes -- Effect of warming limes -- Quantity of lime required -- The Buffalo method -- Action of old limes -- Solution of hide substance by limes -- Sodium and potassium hydrates -- Payne and Pullman’s process -- Alkaline carbonates -- Alkaline sulphides -- Sodium sulphide -- Calcium Sulphydrate -- Gas-lime -- Tank-waste -- Lufkin’s liming preparation -- Barium sulphydrate -- Realgar, or red sulphide of arsenic -- “Inoffensive” unhairing solution -- Earp’s patent -- Unhairing on the beam -- Unhairing machines -- Vaughn machine -- Leidgen machine -- Unhairing in stocks and wash-wheel -- Jones machine -- Fleshing -- Vaughn fleshing machine -- Rounding PAGE 119