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Nowadays the word celadon is primarily used to denote the colour, but the true meaning is stoneware that was fired in reduction, with a ferrous glaze. Sometimes ‘impurities’ such as plant matter are added to the glaze.
The iron in the glaze reacts to the clay. By reducing the amount of oxygen in the kiln, this reaction is amplified. This is called reductive firing.
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One of the oldest decoration techniques in ceramics is painting with clay slip.
You just threw a new coffee cup. And it turned out well too, only the sides could be just a little smoother.
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