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Overfired Polar Ice porcelain. This bowl fired with an oval-shaped rim and was sticking to the shelf.
| Media | A 3-minute Mug with Plainsman Polar Ice Tony Hansen takes you through the steps from opening the box and wedging the clay to taking the fired mug from the kiln. | 
| Tests | Pyroplastic Deformation How to measure the tendency of a ceramic body to warp during firing. | 
| Troubles | Warping There are multiple reasons why pottery and porcelain pieces can warp during firing, both vitreous and non-vitreous ware. Here is what to do about it. | 
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