We have used Tenex Uniblack, if that doesn't hide it we have also used a led & felt pad with some black oxide coloring. This heated up the stone and put the color back in. This problem will reoccur. You might want to talk the customer into taking out all the dye and keeping the top gray.
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Facility Specialists have been serving the Philadelphia / Delaware Valley area with Natural Stone Restoration, Marble Polishing, Concrete Polishing and more.
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