If this is not done, many problems can occur when the product is glazed and refired. Stoneware is vitreous and contains a high percentage of glass in the fired product. For color variations, mature the ware under reducing conditions. Because color is very important, these bodies need to be fired with plenty of air below red heat to be sure all the carbon is removed. Shrinkage is high and special care must be given to supporting porcelain during firing or it will warp and distort.
Design shapes carefully.
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