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STONE DARKENER is a solvent-based color reviving treatment, it is transparent, impregnating and cross-linking for marble, travertine, stones, granite with rough, sandblasted, brushed, flamed or polished finish. Generally applied when the stone is discolored. The product lends an excellent degree of water-repellency as well. The surface thus protected resists for a long time to the aggressive action of acid rains, atmospheric agents and UV rays.