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How to Identify Marble Stain or Etch?

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It is important to first identify whether your marble is stained or etched. How do we identify marble stain or etch? First, let’s compare marble staining vs. etching. Quite simply, if the affected area is darker than the natural stone’s colour, you have a stain. Alternatively, if the affected area is lighter than the natural stone’s colour, you have an etch.

Here are some examples of each to give you a visual understanding:

Staining:

Notice the large blot in the middle of the counter-top below. You can see the marks are darker than the stone surface.

Remove stain from marble

Etching: 

Notice the large blot in the middle of the counter-top below. You can see the marks are lighter than the stone surface.

Why the problem?

Okay, so now we can identify between marble stain or etch, but what causes them?

The most important thing to keep in mind about your natural stone is that it is absorbent. Like a sponge, your stone is porous – meaning that liquid spills can seep into the stone and cause these discolourations or dullness. 

Marble staining occurs when a liquid is absorbed into the stone and is trapped beneath the surface. It is essential you ensure your surfaces are always properly sealed to prevent stains from occurring in the first place. 

Stone etching is mostly caused by, but not limited to, acidic liquids. The acidic liquids corrode the stone surface, eating away at the finish, resulting in the etched look. It only takes mere seconds after spilling for these deficiencies to appear!

Common household liquids that can be responsible for your discolourations include bleach, citrus, citrus-based products, alcohol and alcohol-based products, sodas, ink, rust, urine, coffee, cooking oils, and hand lotions… to name a few.

Many make the mistake of using improper cleaning products for their stone floors or countertops. Always be attentive about the make-up of certain cleaning products, as many can lead to damaging the stone, sealer, and even making the affected areas worse.  We highly recommend MC24 for marble floors and R311 Spray for countertops as daily cleaners. 

How to remove staining and etching:

  1. Stains – (Poultice) To safely and properly remove stains from marble surfaces use wet poultice to absorb the stain from the natural stone.  Learn more about stain removal and how to use poultice here
  1. Etches – (Marble Refinishing Kit) The Marble Clinic has put together a do-it-yourself (DIY) solution to remove marble etching. The Marble Refinishing Kit contains everything you need to properly and safely remove etches. Learn more about the Marble Refinishing Kit here.
The Marble Clinic

The Marble Clinic

Natural Stone Professionals; specializing in the restoration, repair and maintenance of marble, granite, terrazzo & more.

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George
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George

I’m not that much of an internet reader to be honest but your sites really nice, keep it up! I’ll go ahead and bookmark your website to come back later. Cheers

Elle
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Elle

Please help. I sanded and polished my black marble hearth to remove etching and now there is a huge milky area with tiny bright white dots all over it.

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