Test tiles are a way for a potter to test glaze combinations to see how they look together. It is necessary to do so because of the chemical changes that happen during the glaze firings. Some glazes that you think would look good together will have chemicals that react with each other and produce fugly results. The only way to make sure that the glazes will look nice with one another is to actually use them, and test tiles allow you to do so without having to risk ruining an entire piece of pottery in the process.
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