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Most ceramic plates, bowls, and cups have an unglazed rim around the very bottom, where the piece was in contact with the floor of the kiln. This unglazed ceramic is harder than metal and can be used just like a sharpening stone.
Most ceramic plates, bowls, and cups have an unglazed rim around the very bottom, where the piece was in contact with the floor of the kiln. This unglazed ceramic is harder than metal and can be used just like a sharpening stone.
