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Potters can learn this from a commercial manufacturer. This stoneware mug was bought at Ikea. The body is a highly vitreous bone-colored stoneware, likely fired to around 2200F (1200C). The inner glaze is a dark amber transparent (similar to GA6-B) and the outer is a floating blue (similar to GA6-C or G2917). The fired glaze thickness is about 0.5 mm inside and out. Keeping the thickness to a minimum on the inside avoids glaze compression issues.
Glossary |
Glaze thickness
Many ceramic glaze benefits and issues are closely related to the thickness with which the glaze is applied. Many glazes are very sensitive to thickness, so control is needed. |
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