Etches are damages that have occurred to the surface of the stone that create a dull spot. Mostly caused by spills containing any type of acid: Citrus, wine, alcohol, vinegar, pet accidents all contain acids.
Etches mga pinsala na naganap sa ibabaw ng bato na lumikha ng isang mapurol spot. Mas madalas na sanhi ng spills na naglalaman ng anumang uri ng acid: Citrus, alak, alkohol, suka, pet aksidente lahat ng naglalaman acids.