Ingredients

Ingredient Amount
Barium Carbonate 9.26
Gerstley Borate 4.63
Whiting 16.66
Cornwall Stone 23.15
Custer Feldspar 46.30
Add Amount
Black Copper Oxide 0.93
Copper Carbonate 7.41
Bentonite 1.85

Instructions


This glaze has great versatility. Bermuda (see Base Terra Sigillata) works well as an underglaze with Rob's Green. Fired to cone 11–12 in the wood-salt chamber of a noborigama, this glaze develops a very rich and depth of color.

Glazing Over Terra Sigillatas

After bisque firing, the sigillata surface is less absorbent than the clay. When dipping and pouring glazes I adjust the glaze for the correct thickness on the bisque clay and then brush a light coating of additional glaze over the areas with the sigillatas. This includes when I am using the sigillata as an underglaze and where a glaze and sigillata overlap. Additionally, where there is an overlap, a light burning terra sigillata (Base, Off White, or Warm Earth Tone) will disappear and be absorbed into the glaze, with very little noticeable effect, while the oxide-rich sigillatas can be used as underglazes.

This recipe was shared by Alan Willoughby in the April 2019 issue of Ceramics Monthly.

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