"Shaving soap is a hard soap that is used to produce lather with using a shaving brush. The lather it produces is used to coat the ...
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face during shaving, softening the hair in preparation for shaving.
While shaving soap produces plenty of dense and long-lasting lather, its use in modern times is less widespread and has been overtaken by various types of shaving cream." - (en.wikipedia.org 09.03.2020)