Figure 27 After sufficient drying, the slab is draped over a hump mold and pressed into place to form the dish. These molds were typically made of fired clay, although a plaster one is being shown here. The dish is now allowed to dry further, to a leather-hard stage. The irregular edge is trimmed with a knife to form a completely circular form and the rim is then crimped or coggled. This molding process helps flatten the slips. After glazing, the surface is smooth.