Granite etching : If you are concerned regarding etching, a permanent damage to your stone, then you want a stone without calcite. Calcite etches when exposed to acids. Sealers do not protect against etching. That means orange juice, lemon juice, grape juice, soda, etc... Any acidic spill on calcite will immediately begin to degrade whether it is sealed or not, because of the chemical reaction between calcite and acid. If you’ve heard about etching on a countertop, this is the result of a acid and calcite reaction. Not all stone has calcite in it. Testing a sample of your prospective granite countertop purchase with lemon juice will reveal whether this selection will resist these spills. Test only a sample as this may damage countertop finish.
Granite, a nearly impregnable material, but is it? Homeowners worry about selecting the best granite counter that will resist damage from spills and stains or question whether and when to seal the granite countertops.
The following common granite counter questions are addressed in this article:
With the test below you can determine which granite will best resist staining and etcing, benefit from a seal or when to re-seal your counters.