I have seen this before and it all has to do with absorbency of the stone. Apparently the blue celeste is more absorbant

Frederick M. Hueston
www.stoneforensics.com
321 514 6845



-----Original Message-----
From: stuart rosen <mail@stoneshine.com>
To: sccpartners <sccpartners@stoneandtilepros.simplelists.com>
Sent: Wed, Feb 25, 2015 11:47 am
Subject: staining

There were many mosaics done-all with same material.
Most didn't stain-but several along the edges of the joints stained.
A 2 part 100% solid epoxy was used.
It only stained the blue celeste nothing else.
Thoughts?

--
Regards,
Stu Rosen
201-446-1200
" EVERYTHING MATTERS"


 
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