Pumice soap


  • Webster's Revised Unabridged Dictionary
    • Pumice soap any hard soap charged with a gritty powder, as silica, alumina, powdered pumice, etc., which assists mechanically in the removal of dirt.
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In literature:

A cold made or semi-boiled cocoanut or palm kernel oil soap is the base used to add the pumice or sand to in making a cake soap of this sort.
"Soap-Making Manual" by E. G. Thomssen