I've been working on creating a matte black glaze. Since I have zero knowledge of glaze chemistry, I've been mostly been adding mason stains to tint base glazes. Just add the black mason stain, right? Well, different things happen with that approach: glossy finishes, blue tones, brown tones, etc. As usual, the answer came from another member of the Berkeley Potters Studio. This time it was Doug Dowers. I saw his black matte bowl on the shelf, and he was kind enough to provide the recipe. The second vase from the right has that glaze on it. The others are only a small sampling of earlier tests.