I have made all my cups, but three are in the firing room. Leather Hard - Clay which has dried sufficiently to be stiff, but is still damp enough to be joined to other pieces. - Bone Dry - Clay that is completely dried but not yet fired. Clay forms are most fragile at this stage. It is important to connect slab work or trim pottery on the wheel when the clay is leather hard because if it's too soft, the clay won't be rigid enough to hold the shape of the foot you carve. If it were to hard, it would damage the tools and would ruin the surface of the clay by scratching off layers in powder and flakes. Also, it has to be wet enough to attach the handles after you trim.
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