Cone 06 oxidation: Concord Grape will fire matte without addition of a clear glaze. To intensify color or for use on dinnerware, apply clear or matte clear glaze.

Cone 6 oxidation: No color change. Recommended clear glaze is SW-001 Stoneware Clear.

Cone 10 Red Underglazeuction: Color shifts Blue Underglaze and lightens. Recommended clear glaze is SW-001 Stoneware Clear.