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.
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