Before you try anything: always speak to a professional before cleaning, treating or applying any product to your stone. Every slab is different, and the wrong product can cause permanent damage. Contact us or a qualified stone restorer first.
Quick answer
Marble etching is a dull, lighter mark left when an acid such as lemon juice, wine or vinegar dissolves the calcium carbonate in the stone. It happens within seconds to minutes, affects marble, limestone, travertine and onyx most, and cannot be prevented by anything that soaks into the stone. The only reliable prevention is a physical barrier over the surface, which is what our Stone Protection Film is.
Key points
- Etching is chemical damage, not a stain, so a poultice will not remove it.
- Calcite-based stones (marble, limestone, travertine, onyx) etch easily. Granite and true quartzite rarely do.
- Nothing that soaks into the stone stops etching. Only a barrier over the surface does.
- Existing etches can be polished out by a restorer, then protected with our film.
What etching looks like
On polished marble, an etch looks like a dull or cloudy patch that stands out when light hits the benchtop at an angle. Glass rings, drip trails and the outline of a lemon wedge are classic shapes. On honed marble etches are less obvious but can appear as slightly darker or smoother spots.
Etch or stain? How to tell
| Etch | Stain | |
|---|---|---|
| What it is | Acid has dissolved the surface | Liquid has soaked into the pores |
| Looks like | Dull, lighter or rough mark | Darker patch or ring |
| Common causes | Lemon, wine, vinegar, tomato, acidic cleaners | Oil, coffee, red wine, turmeric |
| How it is fixed | Polishing or honing | Poultice |
| Prevented by our film? | Yes | Yes |
Which stones etch?
| Stone | Etch risk | Notes |
|---|---|---|
| Marble | High | Calcium carbonate. Polished finishes show etches most. |
| Limestone | High | Soft and porous. Also stains easily. |
| Travertine | High | Calcite-based, often honed or filled. |
| Onyx | High | Calcite onyx is soft and etches quickly. |
| Dolomite | Low to medium | Harder and more acid resistant than marble, but can still etch. |
| Quartzite | Low | True quartzite resists acid. Some 'soft quartzites' contain calcite. |
| Granite | Low | Mainly silicate minerals, but some granites contain calcite and resin treatments can mark. Can still stain. |
| Porcelain | Very low | Acid-resistant, but polished glazes can dull, scratch and chip. |
| Engineered stone | Low | Resin-based. Harsh chemicals can dull it, and it can stain, scorch or discolour. |
Simple test: put a drop of lemon juice on an offcut or hidden spot, wait five minutes, wipe it off and look at the surface at an angle. A dull mark means the stone etches.
How to prevent etching
- Protection film (most reliable). An optically clear film sits over the stone so acids never touch it. It also blocks stains and light scratches. See our films.
- Everyday habits. Use chopping boards, coasters and trays, and wipe spills straight away.
- pH-neutral cleaners. Avoid vinegar, lemon-based and many all-purpose sprays on unprotected stone.
- What does not work. Sealers slow stains but cannot stop etching, and anti-etch liquid coatings wear away and need redoing. Sealer vs film compared.
Fixing existing etches
Light etches on polished marble can be polished out by a stone restorer. Deeper damage needs honing and re-polishing. We recommend restoring first, then applying film to lock in the finish. More questions answered in our FAQ.
Frequently asked questions
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