Ginny C Posted November 5, 2022 Report Share Posted November 5, 2022 Several mugs I made some years ago now can not be put in the microwave for re-heating coffee because the entire mug gets too hot to handle. The clay was B-Mix cone 5. Different glasses but I think they included Running Hot Chowder. (Back before the word Running was added to the name!) Any idea why? Quote Link to comment Share on other sites More sharing options...
Bill Kielb Posted November 6, 2022 Report Share Posted November 6, 2022 (edited) 10 hours ago, Ginny C said: Any idea why? Most likely they have absorbed water / liquid. Unfortunately I don’t have an easy way to remove and test other than firing in an electric kiln with a hold at let’s say 190 for a few hours then maybe raise them to 250 degrees for several hours. If you had an evacuation pump this would be easier and not require the heating. To @Rockhopper point above, I assume they overheat in several different microwaves, easy to try……. Sorry, Maybe someone here will have a better idea. Edited November 6, 2022 by Bill Kielb Rae Reich 1 Quote Link to comment Share on other sites More sharing options...
Babs Posted November 6, 2022 Report Share Posted November 6, 2022 Could dishwasher treatment have gradually affected the glazes? Rae Reich 1 Quote Link to comment Share on other sites More sharing options...
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