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Slate Blue

Slate Blue

Firing temperature : Cone 6 | Surface texture : glossy to satin | Color : blue | Atmosphere: Reduction

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Detail of two mugs glazed with Slate Blue. The mug on the right was fired in a loosely packed kiln in my garage during winter and allowed to cool naturally. The one on the left was fired with the cone 6 slow-cool schedule here. Crystallization of the titanium from the rutile in the glaze shows an interesting variegation and made the surface semi-matte.

Fast cooled, this glaze is a simple transparent dark blue-green. Cooled slower, it makes for a nice layering glaze. Does not run. The crystallizing oxide is titanium, sourced from rutile.

This recipe was shared by Ian Hall-Hough in the May 2020 issue of Ceramics Monthly.

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