Each of these fired fragments is made from a mix of 65 ball clay and 35 nepheline syenite. These are the remnants of a DFAC test done on each (soluble salts concentrate on the outside edge of a disk as it is dried, with the inside protected). Clockwise: Spinks Blend, 54S, OM4, M23, Gleason and KT1-4. Each of these ball clays produced a zero-porosity (zero measured water absorption) dense fired dark-ivory porcelain at cone 6, they all have remarkably similar appearance. Among other things, soluble salts like these differentiate ball clays from kaolins.
| Glossary |
Soluble Salts
In ceramics, certain compounds in clays and glazes can dissolve into the water, then on drying these are left on the surface. |
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