What Things Cause Etching on Granite?

Granite resists etching damage but is not totally immune.

Granite resists etching damage but is not totally immune.

Granite is a siliceous stone, meaning it is composed of silicates such as feldspar or quartz. It is an igneous rock created by volcanic action. While granite resists most types of harm, it is not completely immune to damage such as etching.

Etching Defined

Etching is dulling of the polished granite surface by the chemical action of acids. Granite resists most household acids, except for hydroflouric acid found at trace levels in some rust-stain removers and toilet-bowl cleaners. But if your granite contains traces of calcite, serpentine, onyx or other calcareous minerals that are sensitive to acid damage, you may find dull etch spots on polished granite surfaces.

Preventing Etching

Prevention of etching involves one rule: Don’t allow acids to stay in contact with the stone. That means avoiding acidic cleaning products. Clean granite with a pH-neutral cleaner such as stone soap or a mild dish-washing liquid mixed with water. Preventing etching also means using a cutting board, chopping block or plate when preparing acidic foods such as tomatoes or citrus fruits. Immediately blot up any spills from acidic foods, flush the area with mild dish detergent solution, rinse the area with clear water and towel dry. Consult a professional stone restorer before attempting to repair etch marks on granite.

Photo Credits

  • Thinkstock/Comstock/Getty Images
Suggest a Correction