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... Read More

Q. What is the best way to clean a white marble bathtub? What is the best way to keep it clean? What shampoos and soaps should be used by people in marble bathtubs?   A. The shampoos, soaps, and cleaners you use can damage, stain, or diminish the... 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

If you apply a silicone impregnator to the back of a tile before setting, this may cause a bonding problem. Since most setting mortars are water based they will want to repel the water. Use an epoxy-type setting material. TIP: Before setting any... Read More

The yellowing and graying of certain Italian and Greek white marbles is a common problem that I see all over the country. There are several possible causes for this condition: Maintenance technique-Take a close look at your maintenance program. Are... Read More

I would call the contractor, but it may not be necessary to replace the panels. These dark circles may be the result of moisture bleeding from the setting mortar. It is common for panels to be installed by spotting the backs of the panels with... Read More

The white deposits are salts, which are bleeding through from the grout joints or from the mortar. An acid wash will be required to remove the salts. If the deposits are heavy, try scraping them off before washing the slate with acid. Several acid... Read More

This 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 leaves the mortar, it carries with it dissolved salts which are deposited on the surface of the stone. This... Read More

Q. Natural stone tile installation has water marks that aren’t fading after 2 weeks of installation. Should I apply a poultice to remove the moisture? MSI sells the stone. It's called white oak. It's honed marble, 24 inch tiles, and... Read More