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When recrystallization is used on Thassos marble, yellowing can occur. The yellowing is probably caused by a reaction of the chemicals in the recrystallization product and the iron in the marble. Not all recrystallization products cause this... 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

First you need to determine why you want it waxed. Do you want to add shine, or is your intention to protect it? If protection is your main concern, I would recommend applying a silicone impregnator over a wax. If you want to increase the shine, you... Read More

There are several methods of sealer application. Most sealers can be sprayed on, mopped on or applied with a lamb’s-wool applicator. I prefer the lamb’s-wool applicator because it prevents streaking. Before choosing a method of... Read More

The spotting can be caused by dripping toilet bowl cleaners, which can etch the marble surface. As of this writing there are no sealers that will prevent acid etching. I would suggest purchasing a non-acidic bathroom bowl cleaner, available at most... Read More

This depends on several factors, including how often the shower is used and what type of sealer was originally applied. After identifying the product, refer to the manufacturer’s recommendations. If water is no longer beading on the shower... 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

Several products are designed specifically for cleaning soot and carbon build-up from marble. Contact your marble supply house. Be sure the product is not an acid; apply it per the manufacturer’s directions and allow it to sit on the marble for... Read More

The brown stain is the result of minerals from the soil of the fichus tree. This type of stain is difficult to remove and will require a poultice. Refer to the book “Stain Removal Guide for Stone” and apply the poultice as instructed. TIP To... Read More

Mexican tile is a clay terra cotta-type product, and is very absorbent. In order to remove the oil a poultice is necessary. Refer to “Stain Removal Guide for Stone” and carry out the procedure it describes. If the stain is not removed after four... Read More