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Glaze chemistry, slurry preparation and application thickness. These two mugs are made from the same clay, Plainsman Snow, and Amaco V-303 Terra Cotta underglaze has been applied to each. The dipping glaze on the left was mixed from a recipe, slurried and then sieved at 80 mesh. However the sieve did not break up the agglomerates of Veegum and New Zealand kaolin. This problem can be quickly resolved by mixing batches of the glaze in a kitchen blender at top speed. The glaze on the right is Spectrum 700, it has been well mixed and sieved. The second issue is thickness: The mug on the left was dipped and held in too long, getting it on far too thick. On the right, the gummed glaze was painted on, giving better control to limit thickness (three thin coats were applied).
Glossary |
Terra Cotta
A type of red firing pottery. Terra cotta clay is available almost everywhere, it is fired at low temperatures. But quality is deceptively difficult to achieve. |
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