Penguin Pottery - Clear Glaze - Low Fire Glaze Cone 06-04 for Low Fire Clay (1 Pint) Review (2026)

What this glaze is for

This is a clear glaze formulated for the Cone 06-04 firing range, which covers the common low fire kiln schedule many beginner and classroom studios use for earthenware clay bodies. As a clear glaze, its main job is to sit over underglaze decoration or a colored clay body without adding its own color, letting whatever design work is underneath show through with a glossy, protective finish on top. That makes it a common choice for potters who have already applied underglaze patterns or colors and want a transparent topcoat rather than a glaze that would compete with or obscure that decoration.

Cone range and clay body compatibility

Cone 06-04 is specifically a low fire range, and this glaze is matched to that firing schedule rather than the mid fire Cone 5-6 range that many stoneware clay bodies use. Applying a low fire glaze to a mid fire or high fire clay body, or firing it well past its intended cone range, generally leads to problems like crazing, dulling, or a surface that never fully matures the way the glaze is designed to. Potters working with low fire earthenware clay and firing in the Cone 06-04 range are the direct match for this product, while anyone working in stoneware or porcelain at higher cones will need a different glaze formulated for that range instead.

Pint size for smaller work

A 1 pint jar, equal to 16 fluid ounces, is enough for brushing several smaller to medium pieces or dipping a small number of items, but it runs out quickly for anyone trying to dip larger platters, big bowls, or a full batch of production work in one session. Potters doing occasional glazing, a classroom project, or brushing individual pieces will likely find a pint reasonable, while a studio dipping larger or greater quantities of ware regularly should expect to go through a pint jar fast and may want to look at Penguin Pottery's larger container sizes for that kind of volume.

Brand and labeling

Penguin Pottery positions itself as a pottery-focused supplier, and its low fire glazes including this clear formula are aimed at potters, schools, and studios working specifically in ceramics rather than a broader crafts audience. Clear labeling of the cone range directly in the product name, Cone 06-04, helps potters match the glaze to their kiln schedule without digging through a separate spec sheet, which is useful for beginners who are still learning to read cone ranges and clay body compatibility. This kind of straightforward labeling reduces the chance of a mismatch between glaze and clay body, a mistake that is easy enough to make early on in a beginner's first year of glazing and firing low fire work.

Who this glaze suits

This fits potters working with low fire clay in the Cone 06-04 range who want a clear topcoat over underglaze decoration or colored clay, particularly for smaller-scale brushing or occasional dipping projects. Classroom and beginner studios firing in this range are a natural match, since the pint size and clear cone labeling suit smaller batches and less frequent restocking. Potters working in mid fire or high fire stoneware, or studios dipping large volumes of ware regularly, will need either a different cone-range glaze or a larger container size than this pint jar provides.

Frequently asked questions