Chemical Process
Sulphur addition in soap is done to

Increase its cleansing action
Improve the soap texture
Cure pimples & dandruff
Fasten lather formation

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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

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

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