Hi Pat
What did you find was the solution to this problem?

On Sep 23, 2014, at 6:42 PM, Pat Staples <cpstaples@msn.com> wrote:

Did anybody ever see something like this happen on a new Porcelain floor. They said it is a spill from coffee.
Then the tile supplier recommended cleaning with Aqua Mix tile & grout cleaner (alkaline) and the same thing happened.
No residue on surface, can't feel a difference on tiles, if you wet it, it darkens for a split second
 
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Thank you
Carl Staples
Classic Marble & Stone Restoration
www.Marblerestore.com 
610-356-4100
 
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