Ability to handle acidic foods. To test for acid resistance, slightly squeeze a slice of lemon to get the juices flowing, and leave the whole slice on the glaze overnight. See if the color changes. If it does, there is some leaching going on. A customer could run into this same color change, and there may be chemicals leaking out. Another way to test this is to put a sample in vinegar for 3 days. Finally, there is lab testing, described later.

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