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The left two were made from a 100% mix of Lincoln 60, the right one adds 2% bentonite (Lincoln 60, by itself, matures into a stoneware at around cone 8). While it was possible to throw the pure material, the plasticity is a little lower than a normal pottery clay. That being said, it is smooth and has a soapy feel that makes it very pleasant to work with. A simple 2% addition of bentonite transformed it into a delight to throw! That only increased the drying shrinkage by about 0.5%. A potters wheel can thus be seen as a laboratory instrument, giving one the ability to make a comparative assessment like this (that no pairs of datasheets full of numbers will reveal).
Materials |
Lincoln 60 Fireclay
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