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Unit 5 Topic 8
The Unity Formula
What is the significance of the Al2O3 : SiO2 ratio?
The Al2O3 : SiO2 ratio indicates the potential for crystals to develop in the glaze.

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The Al2O3 : SiO2 ratio indicates the viscosity (tendency to run) of the glaze and the degree to which it may be clear and textured.
If the Al2O3 : SiO2 ratio is too high the glaze may be clear and unstable.
The Al2O3 : SiO2 ratio indicates the amount of clay which should be used in the glaze.
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