Maintaining Antiqued or Leathered Absolute Black Granite

QUESTION:

We recently had antiqued absolute black granite installed. The installer applied a granite sealer, but did not color enhance it as I like the lighter grey color.


I asked him about some streaks before he left, and he said they would wipe off over time. They didn't, so they came back, applied acetone, and then re-sealed it.

Then a week later I cleaned my glass stove-top with a cleaner made for pots and pans, some got on the granite surrounding the glass stove-top and has now lightened to a pale grey color.

I called the granite dealer and he said we should only use soap and water to clean, I explained that some of the stove top cleaner got on to the granite.

So my questions are...

1 - Is this normal, that you can only use soap and water on the stove top and if any of the stove top cleaner gets on to the granite that it would "stain" and...

2 - What is he doing wrong? He said he will come back again, apply acetone and re-seal.

ANSWER:

Most likely it is the sealer itself that reacted to the cleaner and caused what is called an "etch mark."

Some sealers are reactive to acids and especially if there is dried sealer right on the surface, which is what the streaks were.

Etching is a problem with marble, because marble is reactive to acids, but granite is not sensitive to acids, so it is not the stone itself.

Absolute Black granite typically does not need sealing since it is so dense and essentially does not stain.

However, antiqued, honed or otherwise non-polished finishes can require additional granite care. They may take a sealer since these finishes leave the stone more porous than a polished surface.

The installer is not doing anything "wrong" per say... except perhaps not being exacting
enough in his application of the granite sealer and/or testing to see if the surface even needed it.

Just to be clear... what you have is not a "stain." Stains occur when substances absorb into the stone turning the stone darker in color. You are not likely to ever stain this granite especially if it is sealed properly.

Your spot is a "lighter pale-grey color," so you need to find out what is being etched.

I suggest that you do a little maintenance and experimenting yourself to diagnose the spot by cleaning with acetone and then testing with lemon juice.

Once cleaned an dried, perform the lemon juice test on the cleaned area. Let it sit for a few minutes and wipe clean.

Does it leave a lighter spot? It shouldn't. Now do the same on an area that was sealed, but not cleaned with acetone/methylene chloride.

Does the lemon juice leave a spot on this area?

If yes, then you have your answer... the sealer is reactive to acids and it is probably not being absorbed or applied properly.

It is very important, especially with low-absorbency stones like absolute black that you do NOT let any sealer dry on the surface.

You should also test if sealing is needed (follow lemon juice test but with water) once you have stripped the sealer off.

Regarding soap... It is often recommended, because everyone has soap, it's cheap and won't "hurt" your stone, but it is not recommended as soap residue builds up over time making the surface look dull and dirty... then you need to strip it off.

Just not a smart or effective cleaning method.

We recommend using products formulated specifically for natural stone. You'll find products and brands that we've found perform the best at the Stone Care Center.

For regular granite counter top maintenance and cleaning, you should use Granite Countertop & Marble Cleaning spray.

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Leathered Countertop Smudge
by: Anonymous

My leathered black granite countertop on my island is a smudge magnet. I was keeping up with it by using an envirocloth. This was working very well.

The other day, some Jet-Dry Finish Rinse Aid spilled on the countertop creating two large smudges. The smudges are a lighter grey than the rest of the island. They are very noticeable.

What can I do to get rid of these marks?

==== Countertop Specialty comment:

Black granite is a great choice in many ways, but it can be smudgy and strange etch-like marks sometimes happen.

It could be that the Jet-Dry reacted with a sealer applied. Try cleaning with acetone. If that doesn't work, then have your installer come take a look. Refinishing may be needed, but that's tough on a leathered surface.

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