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Clay from London construction sites: a working guide
London ground is full of clay, and building sites dig huge amounts of it. This is a plain guide to what that clay is, where it goes now, whether it is any good for ceramics, and what we found firing one batch of it.
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Adding 2.5% barium carbonate made Park Royal clay cast.
Dug Park Royal clay would not slip-cast. Every sodium deflocculant failed or gelled it. 2.5% barium carbonate made it castable.
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The Park Royal clay firing story, batch by batch.
Clay dug from a Park Royal building site, fired from 700 to 1150 C in six batches. Absorption bottoms out near 1050 C, then the clay over-fires.