Etching vs Staining on Marble: How to Tell the Difference

The quick test

A stone restorer quoted by the Natural Stone Institute's Use Natural Stone site puts it simply: if a spot is lighter than the surrounding stone, it's most likely an etch mark, and if it's darker, it's probably a stain.

Etched marble: what it is and why it happens

Etched marble is marble whose surface has been dulled by an acid. Marble etching shows up as pale, cloudy patches, rings or drip trails, often where lemon, vinegar, wine, tomato sauce, soda or an acidic cleaner touched the stone. It is a chemical reaction, not a stain, so it can happen on sealed and unsealed stone alike. The questions below cover what etching looks like, which finishes show it most and how to fix it.

New to the stone? What Is Marble? explains why it reacts to acids, and our care hub has everyday habits that keep etch marks away.

Why marble etches

Marble is made of calcite (calcium carbonate), and calcite is also the main ingredient in travertine and onyx. Calcite reacts with common acids: an etch is chemical corrosion of the stone's surface layer, which leaves a dull mark. That's why sealer can't help: a sealer slows liquids from soaking in, but the reaction happens on the surface. One restorer quoted by the Natural Stone Institute's Use Natural Stone site says sealer "does nothing to protect etching, no matter how much sealer you use."

Some spills do both. Wine, for example, can etch the surface and, if it's left, stain it too.

Etches show more on polished marble

On a polished finish, an etch mark is often invisible straight on but appears duller and less shiny at an angle. A honed finish often makes etch marks less visible than a polished one.

What to do about an etch

• Don't use a stain remover or add more sealer. Neither affects an etch.
• Light etching on polished stone is usually a job for a professional stone restorer, who can refinish or re-polish the area.
• To prevent it, wipe up acidic spills right away, use coasters and trays, and clean only with pH-neutral products made for stone.

What to do about a stain

Identify what caused it, then use the right poultice. See How to Remove Stains from Marble and Stone Floors.

Does this apply to other stones?

Acids can affect any stone that contains calcite or dolomite: marble, dolomitic marble, limestone, travertine and onyx. The Natural Stone Institute notes that siliceous stones, made mainly of silicate minerals like quartz, generally resist most household acids. If you're not sure what your stone is made of, treat it as acid-sensitive.

Marble etching questions: looks, causes and fixes

What is marble etching?

Marble etching is damage to the surface of calcite stone caused by an acid. The acid dissolves a thin layer of the stone and leaves a rough, dull spot where the polish used to be. People also call it etching on marble or etch marks. Marble, limestone, travertine and onyx can all etch.

What etches marble?

Anything acidic: lemon and other citrus, vinegar, wine, tomato sauce, soda and juice, plus acidic cleaners such as many bathroom, lime and toilet-bowl products. Even sealed marble etches. Wipe up acidic spills at once, use coasters and trays, and clean with a pH-neutral cleaner, as in how to clean marble floors.

What does etched marble look like?

Look for a dull, lighter or cloudy spot, sometimes a ring or drip shape, that doesn't wipe away. On polished marble it's easiest to see from an angle with light across the surface. Unlike a stain, it isn't darker than the stone, and it can feel slightly rougher than the area around it. Not sure? Compare it with the table in The quick test.

Why does black marble show etching so much?

On dark polished marble, etch marks look pale and cloudy against the deep color, so they stand out. The chemistry is the same as with white marble. A honed finish helps hide marks. See Nero Marquina marble and browse Nero Marquina tile.

Does honed marble etch?

Yes. Honed marble etches chemically just like polished marble. The difference is that honed marble has no gloss to lose, so etch marks are usually less visible. That's why many people choose honed for kitchens. See honed vs polished stone and honed marble tile.

How do I fix etching on marble?

Light etching on polished marble is usually a job for a professional stone restorer, who can refinish or re-polish the area. On honed marble, a professional can re-hone it. Don't use stain removers or extra sealer, and avoid DIY polishing powders unless they're made for your exact stone. To stop it happening again, wipe up acids right away.

Can I replace an etched marble tile?

Yes. If etching is deep or in a spot you can't live with, a single tile can be replaced by a tile installer. That's why we suggest keeping spare tiles from your order. See our Same-Lot Guarantee for matching tiles, or browse marble tile.