The language of art will never adequately describe this issue or its solution
This is crazing. It is bad on functional ware. Shivering and leaching are also bad. And blistering. And other problems like devitrification and clouding compromise the visual appearance of ware. Science is needed to understand what these are, how serious they are and determine the cause and solution. And the language of science is needed to clearly describe all of this. And methodical testing to prove the solution. It is not rocket science, just simple ceramic science.
Glaze Chemistry Glaze chemistry is the study of how the oxide chemistry of glazes relates to the way they fire. It accounts for color, surface, hardness, texturem, melting temperature, thermal expansion, etc.