black stains on Sandstone
Mike Marsoun 03 Apr 2010 07:56 EDT
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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