We fixed polish marble because sound hollow, injected grout in drilled hole and after treated with grind machine, put grout(Mapei) suposed to be beige and the next day turn Rose , Do you have idea Why? We used to clean after put Mapei grout Hurricane
You can try to re-grout a thin layer of regular color grout over the existing color and hope that it holds.
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In that time he has continually heard complaints from various tradesmen breathing dust of all sorts from mixing mortar, grout, for tile, cement, skim coating and Ardex and Mapei self-leveling products. His design is based on the theory that the best way to keep hazardous dusts from your lungs and skin is for the dust to never get there in the first place....
