Nezumi-Shino (mouse-gray Shino) is very famous and is achieved by overlaying a Shino glaze (e.g. Currie Shino 2b) over a Gosu slip. Then the surface needs to become textured.
The original Gosu receipe (e.g. from B. Leach) is difficult to create, as one of the ingredients is black Cobalt Oxide, which is very special and hardly to be purchased outside of Japan.
Gosu 2 is a substitute receipe
While Gosu 1 stays black even when super positioned with the Shino glaze, with Gozu 2 the blue Cobalt Oxide is coming partially to the surface.
The beauty of Nezumi glazes can be seen especially when looking into the glaze details. Therefor Nezumi glazes are highly esteemed for Chawan bowls.
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