"Minerals which are included in glaze recipes for their property of opacification. Opacity is the result of light interference inside and at the surface of a glaze. This can occur in three ways: when light strikes opaque matter suspended in the glaze, when light is deflected by crystal facets and when it is deflected by matter of less than wave-length size."
-The Potter's Dictionary of Materials and Techniques

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The most effective opacifier to produce even, opaque, glossy glazes. The normal use of Tin Oxide in a glaze is between 5% and 10%. A dull matt glaze can result when used in excess.

Important opacifier. Often used in glaze to affect acid resistance, color and texture.