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Unread 06-07-2021, 11:01 PM   #1
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Stone Discoloration

We have a brown discoloration on the stone around our fire place as shown in the pictures below. We used a magic eraser (probably a bad idea) to get rid of it a few months ago but it has come back in the same spot. Any ideas on what is causing this and suggestions to clean it would be greatly appreciated. Thanks!

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Unread 06-09-2021, 08:20 AM   #2
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Hi Stewart,

I'm guessing it's moisture. If it were on only one piece of stone I would say it might be iron oxide, rust, in the stone makeup.
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Unread 06-09-2021, 05:41 PM   #3
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I agree with John, not sure what else it could be.

After a heavy rain, I'd open the fireplace doors and look inside with a flash light, especially on the left side. You might see moisture in the firebox or it might be running around the box.

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Unread 07-28-2021, 11:44 AM   #4
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Is this a wood burning fireplace with a metal firebox or is it gas with metal box. Do you have a flue cap on top of the chimney?

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