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Under fireing clay


ronfire
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If it fully vitrifies at cone ten firing less will mean it’s not fully vitrified and likely more absorbent as well as not as strong as fully vitrified. 

I looked at your website and depending upon absorption it may not be  considered microwave safe. Dishwasher safe is interesting in that the dishwasher wears away glazes more so than perhaps anything else. Even though not necessarily a clay thing,  glazes  that fall outside a  range of flux ratios have been tested and  often degrade significantly with each washing. 

Just a few possibilities though.

Edited by Bill Kielb
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