Your thought:  “I’m thinking that maybe the tiles were factory impregnated with phenolic resin and the resin has turned in a few places. "

I think your right. Especially since whatever is happening is not carrying over to the next tile. Its an indicator its nothing with the underneath touching the tile like thin set  or being applies to the face to clean them. May look into replacing the individual tiles if possible. Good Luck

On Sep 22, 2018, at 1:43 PM, Bstandish <bstandish@facspecs.com> wrote:

Hi Partners. I told a homeowner that I would come out to do a test on some granite that has been stained. There are intermittent tiles that have become yellow although those around them have not. The stains do not carry to the tiles around them. Has anyone experienced this or have any idea what is going on?  I have never seen this before. I’m thinking that maybe the tiles were factory impregnated with phenolic resin and the resin has turned in a few places.
Thanks for any insight
B


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________________________________________
From the desk of
Baird Standish
Managing Partner
Facility Specialists, LLC
12 West Willow Grove Ave.
Philadelphia, PA 19118
Phone: 215-732-7505
Fax: 215-546-9160
www.facspecs.com

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