Etching on Marble: What It Is and How to Fix It

You squeezed a lemon, wiped the counter, and now there is a dull patch that only shows when the light hits it. That is an etch. It is the most common mark on marble, and it is different from a stain.

The facts below come from the Natural Stone Institute, the trade group for the natural stone industry, and from Use Natural Stone, the Institute’s website for homeowners.

What an Etch Is

The Natural Stone Institute says “Etch marks are caused by acids left on the surface of the stone.” Marble is made mostly of calcite, which the Institute says “is vulnerable to attack by mild acids, including those commonly found in kitchen and bar settings.”

A stone restorer described it to Use Natural Stone this way: “When marble comes into contact with anything acidic, it can etch, which looks like a dull spot or burn mark.”

The usual causes in a kitchen, from the same article: “tomatoes, citrus fruits, juices, alcohol, and vinegar.”

Etch or Stain?

Look at the mark from a few angles.

Dull, rough or lighter, and easier to see in side light: an etch. The acid ate into the shine.
Darker or colored, from any angle: a stain. Something soaked in.

It can be both. The Institute says “Some materials will etch the finish but not leave a stain. Others will both etch and stain.” If there is a stain, deal with it first. Our marble stains guide covers that.

Fixing a Light Etch

The Institute’s method uses marble polishing powder, “available from a hardware or lapidary store, or your local stone dealer.”

“Once the stain has been removed, wet the surface with clear water and sprinkle on marble polishing powder.”
“Rub the powder onto the stone with a damp cloth or by using a buffing pad with a low-speed power drill.”
“Continue buffing until the etch mark disappears and the marble surface shines.”

There are also etch remover products sold for marble. One homeowner who wrote about a year with marble counters for Use Natural Stone said “The etches disappeared with a couple of minutes of rubbing an etch remover product into the dulled mark.” Follow the label on whatever product you buy.

When It Needs a Professional

Deep or wide etches will not buff out by hand. The Institute says to “call a professional stone restorer for refinishing or re-polishing etched areas that you cannot remove.”

This is normal upkeep for marble, not a disaster. Restorers told Use Natural Stone that polished marble may need refinishing every two to three years and honed marble every three to five. One said “there’s almost an endless amount of times marble can be refinished.”

Sealing Does Not Stop Etching

Sealer helps with stains, not etches. A restorer told Use Natural Stone a sealer “does nothing to protect etching, no matter how much sealer you use.”

We seal every natural stone slab before we install it, and that slows stains down. On marble, keeping acids off the stone is still the only real defense against etching.

Honed Marble Hides It Better

Finish matters. A restorer told Use Natural Stone: “You may notice etching more on polished marble than honed or textured.”

The homeowner from that Use Natural Stone article chose a honed finish “for its ability to hide etches,” and wrote that the etch marks are “only noticeable from certain angles as light hits the stone.” The article ends up treating them as part of the stone: “I prefer to look at them as a natural patina on a natural stone.”

If you are choosing marble now and etching worries you, a honed finish is worth asking about when you choose your stone.

How to Prevent Etching

Keep lemons, vinegar, wine, juice and tomato off the bare stone. Use cutting boards and trays.
Wipe up acidic spills right away.
Clean with a mild soap or a cleaner made for stone. A restorer told Use Natural Stone: “Read the product label carefully and make sure it’s for stone.”