Description
Colemanite is a naturally occurring source of Boron. A powerful primary or secondary flux 4.5% SiO2 in glazes. It intensifies the effect of colouring oxides and increases craze resistance of glazes. P2954 (Calcium Borate Frit) may be used as an alternative.
43.9% B2O3
26% CaO
4.5% SiO2
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