Colemanite

£6.52
Article number: P-1789
Availability: In stock (3)
B2O3 43.9%, CaO 26%, SiO2 4.5%.  Insoluble source of boron. A powerful flux which can intensify colouring oxides and increase craze resistance - however make sure that you sieve out any coarse material. Glass jar is for illustration purposes only.
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