Thread: Efflorescence?
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Unread 06-06-2006, 06:42 PM   #2
John Bridge
Join Date: Mar 2001
Location: Rosanky, Texas
Posts: 68,050
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Hi Don, not so fast.

I'll bet if you scratch the surface anywhere in that installation you'll find the right color of grout underneath. It's almost always a case of something or other migrating to the surface. Check it out.

If I'm right, I might recommend a little stronger acid treatment. Grout stain only works to darken the shade or to at least make grout the same shade throughout the installation. It does NOT make dark spots lighter. It might help to put a picture up here.
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