Chemical Process
The purpose of tanning in leather industry is to

Smoothen the leather
Stiffen the leather
Make it flexible
Impart water resistance

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Chemical Process
Oils are partially hydrogenated (not fully) to manufacture vanaspati, because fully saturated solidified oils

Are prone to rancid oxidation
Have affinity to retain harmful sulphur compounds
Always contain some amount of nickel (as their complete removal is very difficult)
Cause cholesterol build up and blood clotting

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