Etching is the single most misunderstood stone problem we see. Most clients call it a stain. It is not a stain. It is a chemical burn.
What etching is
Calcite-based stones — marble, limestone, travertine, onyx — are made of calcium carbonate. When acid touches them, a chemical reaction dissolves a tiny layer of stone at the contact point. The result is a dull, slightly-rough zone in an otherwise polished or honed finish. Under light, it shows as a hazy halo or ring.
What it isn't
A stain sits on top of the stone and discolors it. Etching is a physical change to the surface itself. That distinction matters because the two require completely different fixes.
Common culprits
- Citrus juice — lemon and lime are the worst offenders
- Wine — both red and white
- Vinegar — common in salad dressings and household cleaners
- Tomato and tomato-based sauces
- Carbonated drinks and many fruit juices
- Bathroom & tile cleaners sold as "scum removers"
Why sealers don't stop it
Penetrating sealers prevent staining by blocking pores. Etching happens at the surface, above the sealer. A sealer only buys you time to wipe a spill before staining sets in — it does not prevent the chemical reaction.
How professionals fix it
Etching is corrected by physically removing a microscopic layer of stone — typically through honing with diamond abrasives, then re-polishing. Done correctly, it is invisible. Done with the wrong grit or the wrong sequence, it makes things worse.
The shorter the acid contact, the smaller the etch. Wipe spills immediately and you may never need a polish.
When to call
If you can see hazy rings, lost-shine zones, or "water spots" that don't wipe away, that's etching. Our stain and etch removal service handles it, usually in a single visit.