Because they dry and stiffen much faster. When the handles are glued on with slip about an hour later they are about the same stiffness as the mugs. The handled mugs, which are sitting on plaster batts, will then be covered with cloth and plastic over night. The next morning, the bases will have stiffened and all sections of the mugs will be about the same stiffness, ready for trimming. After that they will be decorated, then placed on smooth wooden batts and wrapped with a cloth for drying.
Drying Ceramics Without Cracks
Anything ceramic ware can be dried if it is done slowly and evenly enough. To dry faster optimize the body recipe, ware cross section, drying process and develop a good test to rate drying performance.
In ceramics, handles need to be applied to many types of ware. There are things to know not just to make them look good, but to be strong, durable, practical.
During drying clays and porcelains shrink as they become rigid. When this occurs unevenly, cracks are the result.