In November 2022 The Enamelist Society invited Jessica Turrell to teach a Zoom workshop on ‘Layered Sifting on Etched Surfaces’. Among a number of novel slants on etching and enamelling, she demonstrated grinding fire scale with black enamel and then applying it to a fired surface of the same black enamel. When fired again, the enamel with the fire scale remained matt and showed up well against the shiny black of the first coat.

Fire scale is copper oxide, so I wondered if the same thing might happen if other oxides were mixed with matching enamels. Underglazes are oxides, so I mixed some with a toning opaque turquoise (roughly half a teaspoon of each). Applied through a riso screen onto a fired layer of the same enamel without the oxide it remained matt.

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