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Is London clay any good for pottery?
A short honest answer, grounded in one wild clay dug from a Park Royal building site. For that clay, in these tests, yes for some uses, with caveats.
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How a clay matures, and why hotter is not better.
A plain guide to what maturing means for a clay, why there is a best firing temperature, and what happens past it. Grounded in the Park Royal numbers.