Crazy huh? No seams in my kerdi or backerboard anywhere near that row. No pipes up that high. The stone is italian. I have had some yellow Carrara before but this is all from random boxes and didn't yellow until almost 2 weeks after install. I agree, it must be something leaching through because it's one solid row but I don't know what it could be. I used the same mortar everywhere. I'm stumped. Any suggestions on trying to get the yellow out? I'll probably just have to replace the row. ?????? I didn't have my camera with me unfortunately.
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