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Two out of four samples of porous bodies from Tunisian clays fired up to 1070°C under a fast 45mincycle showed “black core” defects, while the remaining two samples had craters and gas bubbles in the glaze layer. The “black core” is caused by incomplete oxidation of organic matter, while glaze defects are mainly caused by the late release of gas from decarbonation reactions when the glaze is melted...
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