Cutlery Marking
In glazes with this fault rubbing a metal knife or spoon on the surface will leave black marks that cannot be completely rubbed off. This is a common fault in glazes, especially matte glazes. Even commercial tableware often exhibits this problem. It happens because the micro-surface of the glaze is not smooth and has angular protrusions that are actually abrading the metal, taking off tiny bits. Micro-crystalline surfaces will do this. Also, glazes having a high zircon content canb do this (because the zircon particles have sharp corners and edges and can protrude from the surface). Of course, glazes that are not completely melted with also have a rough micro surface that will mark easily. Dealing with the problem is usually a matter adjusting chemistry in the light of understanding the mechanism of the matteness or rough micro surface. In Bound Links
Pictures
Example of a cone 10 transparent that is running severely on a flow tester, but does run on actual ware. The glaze is cutlery marking (therefore lacking hardness). This, the running and likely leaching are due to extremely low SiO2, Al2O3 content.
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