Making a glaze testing cone: Incising the surface

Glaze thickness thins on the edges of the incised lines and thickens at their bases. This enables variegating glazes to showcase their visual effect with varying thickness. And these test the ability of opaque glazes to still cover well when the layer is thin.

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Making Glaze Testing Cones
A standard shape and size of glaze test is important to be able to compare one test with another, especially over time (so that old tests look the same as new ones)

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