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

The Principles of Leather Manufacture · 第 12 / 36 章