Dark Spots on New Granite Countertop

by Green
(Pewaukee, WI, US)

QUESTION:

Hi, We just moved into our newly built house and we had installed the giallo venegiano granite for our kitchen countertops.

The counter top in our dining room hutch is so flawless where as the blocks in our kitchen have so many dark spots. They all came from the 2 granite slabs we chose.

I am starting to doubt if they really installed the pieces I chose. They have some minor dents and a lot of dark spots. I am not sure if it is just the stone itself or if they are water marks.

I am pretty sure that they are not sealed yet. I am hoping I could still do something about it before I seal it. What do you recommend? Thanks, Green

ANSWER:

Without a picture or a more detailed description about what you are seeing it is difficult for me to know the cause, problem or solution for cleaning the granite countertops.

Water can cause dark spots, but when the water evaporates.... so do the spots.

Adhesives can sometimes be a problem . The wrong adhesive or sometimes an additive used with the adhesive will produce spots that often resolve within a couple weeks.... but can persist and sometimes permanent.

What happens is too much glue or the wrong additive is used and the glue absorbs into the granite countertops bleeding all the way to the top surface creating a dark and sometimes green spot.

And many substances can absorb into granite countertops leaving a dark spot, which is a "stain" (vs. light spot = etching).

You will probably need to seal these eventually, but I would NOT seal them until you correct whatever is causing this.

Fortunately, most stains can be removed with a simple procedure for cleaning granite countertops.

Just follow the detailed instructions in the Removing Granite & Marble Stains e-book.

Dents? Now that is unusual... granite is too hard to "dent," chips or cracks maybe, but denting... no idea on that.

If however you have chips or pits, then these can be easily and invisibly repaired using the Marble & Granite Repair Kit for Chips/Pits. The "gel" is for level surfaces and the "paste" for edges and vertical surfaces.

What does your installer say?

Certainly demand a re-install if things aren't satisfactory.

Good Luck,
Ryan

P.S. Get all the facts and simple step-by-step solutions to any problem with our Granite & Marble Maintenance Manuals.

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