I was cleaning glaze off the bottom of a bisque bowl and it -the bottom- literally disintegrated in my hand. I’ve never seen this before so I assume the piece wasn’t sufficiently fired to temperature. I spent quite awhile on that piece so I am pretty disappointed. Might anything else have caused this?
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Hey there Laura! We haven’t had any kiln misfirings or other complaints of underfired work as of late, so I don’t think it is a kiln issue. Another potential would be if the piece had a hairline crack in it that wasn’t evident until glazing. Conversely, holding a piece with tongs tightly while glazing can cause a hairline crack. The last potential could be if the piece was just never actually bisqued. If you grabbed it from the bisque pick up carts, chances are it has been bisqued. It isn’t unheard of though that a student accidentally glazes a greenware piece thinking it was bisqued!