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Researchers have discovered a new cobalt-doped barium aluminosilicate colourant that withstands the high temperatures found in a kiln and provides a bright colour to glazed tiles.—make use of cobalt-based compounds, including the famous “cobalt blue.” In mineral form, the metal has high chemical and thermal stability, and those properties make cobalt aluminate one of the only pigments suitable for high-temperature applications, including pottery glazes.
Then, the researchers mixed the powder into a ceramic glaze, sprayed it onto tiles, and fired them to produce glazed. The pigment was stable at temperatures up to 3200 degrees—well above the typical firing temperature of a pottery kiln—and only experienced slight colour changes when exposed to either acidic or alkaline solutions, demonstrating the compound’s stability.
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