This page provides a set of calculators to help with calculating common material substitutions in glaze recipes.
Warning: These calculators are based on theoretical UMF analysis of the materials, and I have not verified them experimentally. Oxide analysis isn’t the only factor that determines how a material will behave in a glaze.
Each calculator allows for conversions between two material forms. Click “Switch” to toggle the conversion direction. Red cells indicate that a material should be subtracted from the recipe.
Wollastonite / Whiting
Bone Ash / Dicalcium Phosphate
Copper Carbonate / Black Copper Oxide
Cobalt Carbonate / Cobalt Oxide
Manganese Carbonate / Manganese Dioxide