Jim’s Mottled Maroon and Rust Brown Cone 6 Oxidation
Ball Clay 6
Gerstley Borate 22
Tin Oxide 8
Add 4 % Iron Oxide
Fired to cone 6 in oxidation, this recipe produces a glossy, semi-opaque glaze. The glaze gives a rich rust brown over white slip and a maroon brown over the plain stoneware. A depth of mottling is exhibited due to the strong action of the primary flux, spodumene. There is good, consistent coverage and no pin holes. The underlying texture on the clay body remains evident with subtle highlights breaking over line patterns and dark valleys on the horizontal line textures. The Unity Molecular Formula (UMF) for this glaze yields a Alumina to Silicon Dioxide ratio of 1:4.