Raw clays can be volatile in firing

Thursday 21st August 2014

Here is a good reason not to have single-temperature-tunnel-vision when evaluating or using a clay body or clay material. This high-iron clay looks great at cone 3 or 4 (the bottom bar is cone 5 and out-of-place). But by cone 5 the solubles (invisible at lower temperatures) begin to melt. Shortly after it rapidly descends into serious bloating and then melting by cone 8.

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