Quartz Worktop Drill & Fill Colour Correction A large dark coloured particle in a quartz engineered stone can be drilled out, filled with a resin and quartz mix to resemble the surface, taking attention away from the damage. 1 Small colour mismatch, but very visible 2 Looks like a piece of debris 3 On close inspection. its clearly does not belong! 4 Drill out the dark fragment - I call it "stone dentistry"! 5 Mix the resin and quartz filler to match the stone texture and colour 6 After filling, the mark has disappeared 7 Even close up - like it was never there! see more repairs