Efflorescence - Removal and Prevention   By Frederick M. Hueston www.stoneforensics.com The crystallization of soluble salts in Historic masonry causes severe deterioration of the substrate. This crystallization is called subflorescence. These... Read More

  Efflorescence - Removal and Prevention   By Frederick M. Hueston www.stoneforensics.com The crystallization of soluble salts in Historic masonry causes severe deterioration of the substrate. This crystallization is called subflorescence. These... Read More

Q. Discolored granite near sink. Darker near soap dispenser. It's obvious that we didn't seal it properly because it was perfect when it was installed 4 years ago. I tried doing couple DYI solutions to remove Paris of plaster w water... Read More

Q. How do I apply a poultice to remove a stain?A. How to Make and Apply a Poultice: Before you attempt to remove a stain, it is extremely important to know what has caused it. For reference see our Stone and Tile Care Guide. If you have questions,... Read More

Q. Can I use acetone for an oil-based stain on a Pietra Cardosa countertop? If so, how do I apply it? A. Thanks for your question! Since you haven’t specified the type of finish on your Pietra Cardosa countertop or the exact kind of oil... Read More

Q. What is the best way to remove a blue stain on flagstone caused by plant fertilizer? It is several days old. The flagstone is an outside border on a raised planter bed. A. Blue fertilizer stains can be challenging on flagstone, especially outdoors... Read More

Q. We spilled some turmeric spice on our blue stone kitchen floor. Any ideas on how to remove it? A. First, blot up any fresh turmeric with a soft cloth or paper towel. Avoid rubbing. It will push the staining agents deeper into the stone.  NOTE:... Read More

Q. I have a bathroom counter that is bluestone. Before it could be sealed a bottle of liquid hand soap was put on the surface forming a ring. Also several drops of soap were dropped on the surface causing spots. What is the best method for removing... Read More

Q. What is the proper grout for an exterior limestone walkway? Is there a dry grout that can be swept between the stone? Where would I look for stone dust? A. The proper grout will depend on how the stone is set. Will it be set in mortar or placed on... Read More

Q. Refacing a fireplace with 30cm slate tiles. What is the best adhesive to use (only about 25 pieces of tile involved so don't want to have to purchase a 50lb. bag of anything)? Would a premix mastic work? Will I need to provide support for the... Read More