Chemical Process
Salt is added in the kettle during soap manufacture to separate

The metallic soap
The unsaponified fat from soap
Soap from lye
Glycerine from lye

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Greater tendency of decomposition at elevated temperature
All of these
Hydrolysis tendency in presence of water
Poor oxidation stability and high gum forming tendency

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