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These thrown mugs are both soft enough for tooling. The left one is a super-white translucent porcelain, so the kaolin used has poor plasticity. The result is a crumbly material - it is difficult to cut the flutes in the foot ring. It is also difficult to throw. An addition of white bentonite would completely solve this problem. The recipe of the body on the right employs a plastic kaolin and ball clay mix (plus bentonite), it is even more plastic, easier to throw and the fluting is no problem at all.
Glossary |
Plasticity
Plasticity (in ceramics) is a property exhibited by soft clay. Force exerted effects a change in shape and the clay exhibits no tendency to return to the old shape. Elasticity is the opposite. |
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