I see 2 different staining patterns: on grouted section stains are at the joints (most likely from grout) and on ungrouted section they look like a pancakes. I don't see any copping on top of the wall, what is on the top? I think that moisture got between wall and sandstone and setting material is staining from behind. Cleaning that of course will be a challenge and I wouldn't even try it without drying the wall first.

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From: Dr Fred <fhueston@stoneandtilepros.com>
Date: Sat, 3 Apr 2010 09:06:17 -0400
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
Subject: RE: [sccpartners] black stains on Sandstone

very strange indeed...what color was the grout? how was the stone set?  It looks like mold or mildew but cant say for sure..Try taking a couple of drops of bleach and see it removes the black..If it does it is a biological. Where is this located?  what part of the country

On Sat, Apr 3, 2010 at 8:21 AM, <info@restoreyourtiles.com> wrote:
Did you seal that stone before or after grouting?
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-----Original Message-----
From: "Mike Marsoun" <nulifesc@bigpond.com>
Date: Sat, 3 Apr 2010 21:56:34
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
Subject: [sccpartners] black stains on Sandstone

This is strange. For a friend who is a supplier. There is 3 photo's that say
grouted section.  This black started not long after grouting, mainly around
were they cleaned off the grout.  It seemed like the grout contaminated the
stone.   So 80% of the wall they did not grout and
was looking good until a couple of weeks ago, and now that is starting to go
too.
Mike Marsoun
Nu Life Stone Care



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