Zinc can cause some pigments in slips and underglazes to shift color. Zinc-Free Clear, formulated to prevent such color shifts, is a glossy, transparent glaze designed to produce attractive, high-fire effects at mid-range...
Clear is a glossy, transparent glaze that produces attractive, high-fire effects at mid-range temperatures.
Clear Bright is a cone 5 - 6 glaze that may be fired in oxidation or reduction. It's lead-free and safe for use on food containers when fired properly.