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Bone dry means the pottery has been baked in the sun, or warmed in a kiln at low temperature (50 degree C) for long enough to rid the pottery of any ambient moisture. Normally any clay object even dry to the touch has the moisture of the atmosphere and moisture locked in the clay material. There is even more molecular moisture which will be driven off as the pot gets hotter. (100-200 degree C). After a bisque firing (1000 degree C) the pot is completely dry, but very soon after takes back the moisture of the atmosphere, and so is slightly moist once again, and not bone dry.

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Q: What does bone dry mean in ceramics?
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