Opaque refers to nontransparent color. Overglaze is a decorative finish applied over a fired glaze surface and made permanent by firing. Overglaze Compatible is a glaze that will accept overglazes for a third firing. Glazes that contain copper for added color are not overglaze compatible. A Palette Knife is a flexible knife with no sharp point used for mixing or stirring color.
Pinholes are tiny holes penetrating a glazed surface.
Plasticity refers to the pliability of modeling clay. Porosity refers to the permeability of fired or unfired clay. Posts are columns of refractory material used to support shelves inside the kiln. Once the plaster mold is removed, the clay object is known as greenware or unfired clay. Pyrometer is an instrument that indicates temperature in the kiln.