Abstract: A process for the production of a compound bar of soap, said bar comprising a primary piece of soap and at least one secondary piece of soap embedded therein, is disclosed. The process comprises (a) extruding the primary piece and each secondary piece at an extrusion temperature, (b) forming at least one cavity in the surface of the primary piece adapted to receive at least one of the secondary pieces, (c) cooling each secondary piece to a cooled temperature, and (d) embedding at least one secondary piece in the cavity. It is a feature of this invention that, under the embedding conditions, the primary piece has a sufficiently low viscosity to permit flow, and the secondary piece has a sufficiently high viscosity to substantially prevent flow.

Abstract: A new soap bar is disclosed wherein a soap bar comprises a soap bar body having a cavity stamped therein and a raised design or character imprinted in the bottom of the cavity. A smaller piece of soap of another color is used to fill the cavity whereby the imprinted design or character become visible after the mass of soap above the imprint is washed away.