When this product is properly utilized, it can pull out deep, set in stains without discoloring stone. Spinergy StainAbsorb for Stone can eliminate water-born stains such as coffee, soda, tea, wine, juices etc For oil-born stains such as salad dressing, cooking oil, animal fat, etc. the Poultice action is even more important. StainAbsorb for Stone can be used on natural stone such as marble, granite, limestone, travertine, slate and sandstone. It also works on grout for ceramic & porcelain tile, as well as masonry and concrete. Simply pour StainAbsorb for Stone onto the stained area, let it dry, and then sweep it away. StainAbsorb for Stone is a solvent free, voc free product that contains biodegradable surfactants.