TIOX
Stannic oxide — the opacifier that turns a glaze white · Part of it dissolves into the melt; what stays undissolved is what scatters · Soda, potash and boron take more of it into solution · With chrome and calcium in the recipe it turns pink
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Tin oxide is the opacifier that turns a glaze white. Part of it dissolves into the melt, so how much whiteness a given addition buys depends on what else is in the recipe.
Tin oxide does not simply sit in a glaze as ground powder. Part of it dissolves into the melt, and how much depends on the recipe: soda, potash and boron all take more of it into solution, so the same addition does not buy the same whiteness in every glaze. What stays undissolved is what scatters the light and turns the glaze white. A glaze commonly carries from about a twentieth of its weight upward, more for a dense white. With a trace of chrome and calcium in the recipe it turns pink instead.
