Chemical Process
Transparent soaps (e.g. Pears) are

Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency
Metallic soaps with frothing agent from which glycerine has not been recovered
None of these
Metallic soaps with frothing agent and free stearic acid to achieve transparency

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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
Poor oxidation stability and high gum forming tendency
Hydrolysis tendency in presence of water

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