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A variety of colemanite, a naturally occurring mineral, specially imported by us from the USA. Mentioned in many American text books, this is a popular flux in studio glazes.
Formula: 2CaO 3B2O3, 5H2O
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I work mainly with stoneware, using stains and oxides and have found that colours fade when fired at high temperatures. When Gerstly borate is added to clay it becomes watertight when fired to only 950 C, enabling the colours to remain bright. However, adding the correct percentage has become a matter of trial and error.
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