The Scrub-coat is a priming coat of thinned opaque underglaze or glaze. Sealers are spray or brush-on coatings for use over nonfired colors to protect the surface and enhance the colors. A Seam is a ridge formed in greenware where mold pieces join. Sgraffitoing refers to the process of creating a design in ware by gently scratching through applied color to reveal the color or the clay body beneath it or to create carved designs. Shelf Supports are columns of refractory material used to support shelves inside the kiln.
Shelves are flat slabs of special high-temperature materials on which ware is placed inside kilns.
Shivering occurs when the glaze or underglaze and the clay body are incompatible. The clay body shrinks more than the color, causing the color to peel or break away. Shrinkage is the reduction in size of a clay object as a result of firing. A Silk Sponge is used for decorating. It has short hairs on its surface and is soft when wet.