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The left half of this cone 6 whiteware (Plainsman M370) was sponged at the dry stage. That exposed gas-producing particles that are normally pushed under the surface. The result is a greater susceptibility to glaze defects (in this case dimples from incompletely healed bubbles and blisters). While not usually a problem on flat surfaces, this can be an issue when rims of functional pieces are sponged.
The left half of this cone 6 buff burning native-clay stoneware (Plainsman M340) was sponged at the dry stage. That exposed iron-bearing particles that are normally pushed under the surface. The result is a denser population of fired specks. While not usually a problem on flat surfaces, this can be an issue when rims of functional pieces are sponged and glazes stretch thin there during firing.
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