1,148,273. Extruding soap. COLGATE-PALMOLIVE CO. 11 Dec., 1967 [17 Feb., 1967], No. 56222/67. Heading B5A. [Also in Division C5] Soap having specks, streaks or striations of one or more colours is made by feeding soap of a basic colour in milled form to a screw 11, passing the soap through a multi-orificed die-plate 14 to form strands, cutting the strands into lengths by means of a knife 18, adding one or more colouring agents to the strand lengths within a vacuum chamber 16 and extruding the lengths through an orifice 26 by means of a screw 21. As shown, a single colouring agent is supplied from a chamber 21a via a needle valve 23 and a non- corrosive, e.g. stainless steel, tube 22. Chamber 21a is connected via conduit 31 to the vacuum source for chamber 16. Dieplate 14 is backed by a plate 15 having larger orifices and both plates are carried by a ring 19 pivotable to facilitate cleaning. Knife 18 is directly connected to the shaft of screw 11. Barrels 12 and 25 are provided with fins 28 and jackets 29 within which cooling liquid may circulate. Preferably nozzle 26 has a trimming action and shaves, e.g., a 1 / 32 - 1 / 16 inch thick surface layer, off the extrudate. In addition to the colouring agent, an emollient and/or a bacteriostat may be added via tube 22. If such a mixture is of a pasty nature, valve 23 may be replaced by a pump. Detailed examples are given in which the production of soaps having blue streaks on white and blue streaks on blue are described.