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If your glaze can handle more silica and melt just as well then add it!

The cone 6 G1214M glaze on the left melts well. Can it benefit from a silica addition? Yes. The right adds 20% yet still melts as well, covers better, is more glossy, more resistant to leaching, harder and has a lower thermal expansion.

If your glaze can handle more silica and melt just as well then add it!

Links

Oxides SiO2 - Silicon Dioxide, Silica
Oxides Al2O3 - Aluminum Oxide, Alumina
Recipes G1214M - Original Cone 6 Base Glossy Glaze
A recipe developed by Tony Hansen in the 1980s. Its was popular because of the simplicity of the recipe and how well it worked with chrome-tin stains.
Glossary Silica:Alumina Ratio (SiO2:Al2O3)
A formula ratio used to evaluate and predict firing properties in ceramic glazes.
Glossary Food Safe
There is an increasing awareness of the food safety of glazes among potters. Be skeptical of claims of food safety from potters who cannot explain or demonstrate why.
Articles G1214M Cone 5-7 20x5 Glossy Base Glaze
This is a base transparent glaze recipe developed for cone 6. It is known as the 20x5 or 20 by 5 recipe. It is a simple 5 material at 20% each mix and it makes a good home base from which to rationalize adjustments.

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