Seal natural stone after installation and reseal from time to time, especially in wet areas. Clean with a pH-neutral stone cleaner.
Marble: wipe up acidic spills such as lemon, vinegar and wine quickly to avoid etching. Travertine: keep it sealed, especially unfilled travertine in showers. Onyx is softer than marble; use it on walls, backsplashes and light-traffic areas.
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