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Flaking Ceramic


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I agree with Pres. Looks like a plaster pop-out. If you have any plaster lying around your studio, this could be the source.

Plaster bits take moisture from the air, then they expand and blow out. Very frustrating.

TJR.

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Calcium pitting is the same as plaster pitting which is also calcium. It can come naturally in clay ..bits of shells from ages ago for example. Which ever it is, it ruins the surface. Just saying it may not be plaster. I saw earthenware from one supplier that was continuously pitting from this. They had several batches that had contaminated clay. It ruined pieces in my friends production line.

He switched suppliers and clay.

 

Marcia

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Unless it was your clay and your pugmill, it could have anything, including plaster. Does the place you got it from have plater wedging table or do slip molding? Either of those could introduce plaster. Or like others have said, could be natural. Though, you'd think if it was natural, it would be kinda consistent over the piece.

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