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Etching
Etching is a result of a chemical reaction that occurs when acid comes in contact with a surface. Etch marks on stone surfaces resemble water spots or a worn polish. Seemingly innocent items like orange juice, coffee, vinegar, salad dressing, wine, tomato products, mustard and many soft drinks are highly acidic and will etch, discolor or even scratch most marble, limestone and travertine. (Acid-resistant stones like most granites, slate and sandstone will typically not etch, nor will tile.)
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