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  1. My new marble floor has a white powder on it. It cleans up with water, but keeps coming back. Is there anything I can use to clean it off permanently? This is a common condition, especially if the floor is new. When the marble is installed, it is set in a mortar base that is wet. As the moisture evaporates, it carries with it dissolved salts which are deposited on the surface of the stone. This con... Read More
  2. Efflorescence - Removal and Prevention   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 subfl... Read More
  3. Efflorescence - Removal and Prevention 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 salt... Read More
  4. What do I use to reattach glass mosaic tiles? Q. I have installed a stained glass wall and pond. The mosaic sits on a mortar base, redguard sealer, then more mortar to level the surface. The glass mosaic is put up with latacrete. All of this is put on to a 8 x 16 block wall. One side is peeling ... Read More
  5. Should I polish and seal my new marble flooring? Q: Just had a new marble flooring installed (approximately 2500 sq. ft). Contractor did not mention polishing or sealing--job is now over..just told me to use water to clean the floor. I have since tried to find some info----do you recommend polishin... Read More
  6. Have you ever heard of Doctored Travertine? Q: In India, I have heard that Travertine stone is doctored by adding a substrate to the base of another hard cheaper stone. How can I know whether it is so without breaking it? A: Many of the black granites from India are darkened with dyes, but to... Read More
  7. How do I remove the toothpaste stain from my marble vanity? Q: I have a toothpaste stain on my marble vanity top in my bathroom. Do you suggest your product for removing this type of stain and can you give me any additional advice on applying a poultice to marble? A: To remove toothpaste stains from mar... Read More
  8. I understand that some stones that are more porous than others and one application of sealer/impregnator may not be enough. But how will I know? Q. I understand that some stones that are more porous than others and one application of sealer/impregnator may not be enough. But how will I know?A. On granites, at least two applications are recommended, with at least two hours in between applicati... Read More
  9. When will I know if it is time to re-seal my granite? Q. When will I know if it is time to re-seal my granite?A. To find out if your stone is still adequately sealed, spill some water on it and wait for approximately half an hour, then wipe it dry. If the surface of the stone did not darken it means th... Read More
  10. How do I know if my stone should be sealed? Q. Please tell me how do I know if my stone should be sealed?A. There is a good rule of thumb to find out if your stone should be sealed. Spill some water on it and wait for approximately half an hour, then wipe it dry. If the surface of th... Read More
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