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Days of Ceramics.0.3.shino

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Shino is a simple, humble, peasent glaze from Japan that is deep and rich, and always delivers the unexpected. Where the glaze lies thin, it becomes a nice, rust-red/brown. And where it is thicker, it turns white. It is a glze that demands the gas-fired reduction kiln.

(For those not into pottery, allow me to explain:
the coloring agents of glazes, as I understand them, are mainly built of oxides. If you fire with an electric kiln, it can draw all the oxygen it wants in the heating [and most importatnt] the cooling process. Colors in the electric/oxidation process tend to be more vivid.)

But in reduction firing you can close down the exhaust vent [damper] by degrees, and fire in an atmosphere that is gas-rich/oxygen-lean. When the kiln is shut down, you close all vents and let the pots cool/mature in an oxygen deprived atmosphere. So if a glaze depends on chromium oxide for color, and if at the high temperatures, the chromium ions have been driven apart from their oxygen ions...then what?

In an electric fire they can re-bond with oxygen flowing easily back in.

But in reduction firing, it's oxygen starved and the glaze and the pot interact because the coloring agent in the glaze goes to the clay body and robs oxygen. The rich rust/red/browns in the clay in this series would be creme yellow in electric firing.

Why am I telling you this? Go forward the last step.