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Unread 07-31-2021, 07:49 AM   #1
rstetson2
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Grout Discoloring Marble Tile

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Hello,

I have installed a marble tile backsplash and started putting in grey grout. I stopped after doing a small section because it looked wrong to me. The grout seems to be darkening the color of the tile and seeping into the edges. The first image is from a few hours after putting in the grout and the second image is from this morning about 24 hours after grouting. It has gotten better with time.

Will it continue to get better with more time? Should I continue with the grey grout or should I tear that section out and go with a white grout color?

I did seal the marble first with "511 H20 Plus Sealer".


Thank you!
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Unread 07-31-2021, 08:53 AM   #2
Tool Guy - Kg
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Welcome to the forum, Richard.

That can be a bit disconcerting, can’t it? But don’t lose hope, as it may not be a problem.

Darkening around natural stone after grouting can be somewhat common. The sides of the tile are rough and somewhat porous, allowing the tile to darken with what is commonly referred to as “picture framing”. Many times, it’s just moisture that’s soaked into the tile......and once it completely dries, the tile returns to its original look. Sometimes this takes as much as a few weeks.

Are you using a standard cementitious grout that you prepare by mixing with water, or is this another type of grout like epoxy, urethane, etc that uses resins and or other chemicals?

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Unread 07-31-2021, 12:40 PM   #3
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Sometimes this is a problem when grouting with dark grout on a light colored stone and is why we recommend making a sample board before grouting the real deal. I'd give it more time like Bubba said.
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Unread 07-31-2021, 01:21 PM   #4
rstetson2
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Grout

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This is the grout that I used.

Thanks
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Unread 07-31-2021, 01:23 PM   #5
rstetson2
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Drying

Also,

Should I wait a couple weeks for it to fully dry before sealing the grout?
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Unread 07-31-2021, 01:39 PM   #6
Tool Guy - Kg
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Okay, that product is not a cement-based product. It’s not very highly thought of by pros due to its lower performance and fairly heavy shrinkage that results in grout joints that recede and leave somewhat depressed (not full) joints. It’s more similar to latex caulk than traditional cement-based grout. I would wait for what you’ve got grouted to entirely dry in hopes of returning the tile to its original color. If it doesn’t return 100%, it’s time to switch to another product and swap out those few tiles for new.

If you’re leery of your odds at this point, it would be smart to whip up a sample board like Davy suggested and experiment with a different grout. That might end up saving you some time in the end.

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Unread 07-31-2021, 01:59 PM   #7
rstetson2
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Okay, Thanks for the advice! Probably best to make a sample to test things on for future projects.
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