The amazing fluxing power of boron (in borax)

The two top clay bars contain 15% hydrous borax. At cone 06, a very low temperature, it has already melted and drained out of the bars, running down over the others as a glass.

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Links

Oxides	B2O3 - Boric Oxide
Materials	Borax Decahydrate
Materials	Borax Pentahydrate
Glossary	Flux Fluxes are the reason we can fire clay bodies and glazes in common kilns, they make glazes melt and bodies vitrify at lower temperatures.

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