Ingredient Amount
Magnesium Carbonate 6.00
Talc 6.00
Whiting 14.00
Zinc Oxide 6.00
Custer Feldspar 52.00
EPK Kaolin 6.00
Silica 10.00
Add Amount
Copper Carbonate 5.00
Titanium Dioxide 2.00


Use 2–8% titanium dioxide. The mug shown here is glazed with 6% titanium dioxide.

Acknowledgements for the origin of this recipe go to Ivan Albrecht at the University of Miami. Titanium dioxide was added in the following increments: 2%, 4%, 6%, and 8%. If titanium dioxide is omitted, silvery zinc oxide microcrystals are formed on the glaze surface (see 3A). The microcrystalline glaze is a gorgeous blue with purple or gold crystals in this same series of experiments when substituting 1% cobalt carbonate instead of 5% copper carbonate.

This recipe was shared by Ryan Coppage, PhD and Jenn Wicks in the April 2020 issue of Ceramics Monthly.