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It sounds like there may be a moisture problem in the bank lobby. The recrystallization process does not work well when moisture is present. The gray you are getting is the result of moisture reacting with the steel wool and the recrystallization... Read More

Q. We grouted our beautifully installed marble backsplash with Mapei FA+ (color: rain) without sealing it first. It is now grey instead of white. Is there anything I can do to restore the tile to its natural color? I wonder how much the grout color... Read More

Q. We have a tumbled travertine (unsealed) stone floor in our shower. I really need to know how to deep clean this floor, as it has gotten bad - a bit scummy, mildewy, and moldy. How should I clean my shower floor? Can you help? A. Keeping your... Read More

Q. Hello. I just received a new quartzite install, and there is a crack at the sink extending to the hole for the soap dispenser. The fabricator claims it does not affect integrity of the stone, since apparently it's not a full-depth crack. The... Read More

Q. I have a marble table top with a problem, and I need to get some advice on what may have caused it. There are lots of spots plus a few ring shaped marks. The marks cannot be cleaned off. The table was delivered in pristine condition. Is it... Read More

Q. I'm a park educator (park naturalist) working at a fossil site in Canada. I'm putting together sets of fossils for use in classrooms, including some Green River fish fossils, which are in very soft limestone that flakes in delaminates... Read More

Q. I damaged the marble countertop at home. The cleaner I used indicated not to be used on marble. I didn't read properly. Now, I see the drops of spray of this cleaner and permanent stains on several areas. There are little round-dots sprayed... Read More

Q. How do I remove a candle wax stain on bluestone? A. Here are the full instructions for candle wax stains: To remove candle wax that melted into the pores of the stone: Use a hot clothing iron (preferably one you don’t mind getting wax on)... Read More

Q. How would I remove a WD40 stain from an unsealed limestone hearth? A.  To remove WD-40 from unsealed limestone, we recommend the poultice method of stain removal. Mix a good degreaser, which can be purchased at Home Depot or Lowe’s,... Read More

Q. We have 4 chocolate stains on our natural stone hearth. The stains have been there just a few days. We got off the actual chocolate (probably Hersey’s chocolate for smores) and tried to clean the stain with a windex surface cleaner. It... Read More