Ceramic molds, raw

This is the mold before it is fired: clay-form it like any vanilla tool mold, in plate, double ingot or quad rod shape, then bake it in a pit or a kiln to turn it into Ceramic molds, fired, which is what actually casts metal. The colour it comes out as depends on how far through the firing it was when it finished and carries no meaning of its own; every colour of a given shape fires and casts the same. See Casting for what each shape yields and how to switch a mold off server-wide.