Harry Potter snap bar FOOD SAFE SILICONE MOULD. OUR MOULDS CAN BE USED WITH SUGARPASTE, SOAP, CHOCOLATE, CLAY, MARZIPAN, PLASTER, ICE, BUTTER, ISOMALT, CAKE MIX, WAX AND LOTS MORE. Here at silicone moulds UK we have been making food safe silicone moulds for over 10 years.