Leather And Tanning
Sodium bicarbonate can be used to ensure that leather remains supple and soft as well as porous to dyes.
Sodium bicarbonate is widely used for tanning in the leather industry.
Tanning helps preserve animal hides or skins, makes them immune to bacterial attack, raises the shrinkage temperature and prevents the collagen fibres from sticking together on drying.
When treated with sodium bicarbonate, leather remains porous, soft and flexible. Sodium bicarbonate increases the alkalinity of chromium sulphate solutions to assist the cross-linking of chrome complexes with the animal-hide collagen of leather.
The reaction stabilises the animal-hide collagen fibres so that they are no longer biodegradable.
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