-
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.
-
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.