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The hard white deposit is a build-up of salts. These salts—known in the tile industry as “lime putty”—are coming up from the setting bed, and can be very difficult to remove. To remove lime putty, scrape away as much of it as possible... Read More

Think Twice Before Using a Silicon-Based Impregnator on a Historic Limestone Building Limestone, a calcium-based sedimentary stone, is a building material that has been utilized for centuries. The Pentagon, the Lincoln Memorial, The Empire State... Read More

Q. We are building a new house in South Louisiana. We have a 4-inch concrete slab on the ground. Because we are in a flood zone, we had to build up. So, we have concrete piers and wooden beams that our house actually sits on. We then have 1 1/4"... Read More

Q. I accidentally wiped my limestone fire surround on one side with a cloth that had WD-40. It has discolored  the limestone that is stone in color. The discolored area is a few shades darker. How can I bring it back to the lighter color it should... Read More

Q. I am making some improvements to an 87 yr old building with limestone floors. There are some copper stains on the limestone, caused by some moisture and the copper lights bleeding. Please tell me how to clean up this stain. A. Use a soft brush... Read More

Q. I believe I have spill marks of vinegar and also some cleaning solution that stained my marble and limestone floors. I need help in which poultice to use.   A. Marble and limestone are calcium-based stones, which means they are sensitive to acids... Read More

Q. Some lime juice got spilled on my Bluestone table top and it left a big dull spot. Is there anything I can do to bring back the shine?   A. Maybe. If the etch is severe (deep to the point that it looks and feels rough), then you will need to... 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. A Liquid Plumber bottle leaked on my beige limestone bathroom floor. It looks like a wet mark. Is there anything I can try to remove stain? It is a heated floor. A. Liquid Plumber is a very high alkaline substance, which leads our stone expert to... Read More

Q. Our limestone fountain is dyed on special occasions. The purple dye is penetrating the limestone at the bottom of the wall. How can the purple dye be removed from the limestone? I have tried acid and chlorine. Any suggestions?   A. Thank you... Read More