Bating and Pickling
Bating and pickling make the fibres of the hide more receptive to tanning.
Hides are treated with enzymes, similar to those found in the digestive system, to break down proteins. As a result the hides become softer. The duration of the bating process depends largely on the desired softness of the leather being produced. The softer the leather required, the longer the bating process.
Bird droppings and dog faeces have were known to have been used for this procedure prior to the development of industrially-produced chemicals.
This process makes the fibres of the hides more receptive to tanning. Pickling increases the acidity of the hide to a pH of 3, enabling chromium tannins to enter the hide. Salts are added to prevent the fibres from swelling. For preservation purposes, fungicides and bactericides are used.
Videos about the leather production
|Process steps in the leather production|
|storage - soaking - liming - fleshing - splitting - pickling - tanning - neutralising - withering - sorting - shaving - dyeing (through colouring) and fatliquoring - drying - finish - softening - final check|
|Chrome tanning - Vegetable-tanned leather - Synthetic tanning - Tanning with fats and oils|