Hi fellas. Has anyone seen this problem before? Not sure if it was like this prior to installation. It is in random places which makes it seem so and it is not wicking into the grout. 99% sure it is rust but I might do a tannin test. Whatever the case I would like to remove it if possible. It seems very deep set and like it is wicking in thru the edges so it might be through the thickness of the stone. These tiles are small, maybe 3x6".
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