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What Happened To These >-<


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I've made at least 200 of these and never had one crack.   This isn't just a crack ... it's  a split.  I had 2 of them crack in one load ....

 

No changes except maybe the weather.  It's hotter now.   Any ideas on how this happened?  I hope I don't see more of them. :(

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Yep, usually during cooling.  In fact, I had a nice little vase, with a new glaze combination that turned out quite nice.  I took it out, admired it, and set it near my classroom desk.  I looked at it a few times throughout the end of the day.  At the end of the day, I looked at it again, and it had severely cracked, similar to the pictures you posted.  So we are talking hours later, that it cracked.

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 Hmmm .... the base glaze was thicker than usual.  I have someone that glazes and I don't check every batch.   I noticed it thick ... maybe it was this.   I had no idea glazes could do that.   Those 2 glaze combinations share that glaze.  The glaze was so thick I put an extra coat on top of the base glaze to bring out that turquoise green.   That crack is almost 1/2 inch wide ... I never considered it could be the glaze.  I've put out at least 1000 pieces in both of those colors and never saw cracks like these.

 

Do drying errors show in the bisque stage?

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