The present invention relates to a process of preparing bar toilet soap, composed of multiple phases, at least one of them being an opaque phase and at least one being a translucent phase. The translucent phase and the opaque phase(s) are mixed during the process, wherein the translucent phase is incorporated into the opaque phase during the extrusion of this second phase, giving rise to a toilet soap in which one of the phases predominate and the other appears as stripes dispersed in the first one.