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Two Ways to Test Stone Sealer Performance If you want to do a field test to find out whether the sealer on natural stone is performing, you can choose a quick, informal test, no equipment required, or a more scientific test using a Rilem tube. Here... 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... Read More

What Impregnator is Supposed to Do Ideally, when impregnator is applied to stone, it penetrates into the pores of the stone. However, this isn’t always the case.  What Causes Impregnator to Bead Fred Hueston, Chief Technical Director of... Read More

Restoring Stone Sealed With a Silicon Impregnator Every stone restoration contractor knows that when a stone floor or surface is polished, abrasive friction removes the uppermost layer of the stone, revealing the brand new stone underneath. Since the... Read More

How Stone Consolidants Work Exposure to wind, rain, and temperature fluctuations can take a toll on stone and masonry. Other environmental factors that can cause degradation include pollution, physical stresses like vibration, and exposure to acids,... 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

Graffiti Removal Procedure for Stone, Masonry, and Tile Surfaces By Frederick M. Hueston, www.stoneforensics.com If your beautiful building, wall, or other surface has just become the unintended canvas for graffiti, your first reaction might be to... Read More

If a stone fountain has a copper basin, chances are the stone may get green discoloration. The hard, green deposits are a combination of calcium deposits from the water and copper from the basin. The easiest way to remove them is to use a pressure... Read More

Once a stain is removed, it may come back, depending on how deep the stain is or what caused the stain in the first place. If the stain is coming from behind the stone, chances are it may come back. If this is the case and the stain reappears I would... Read More

A poultice is a chemical mixed with an absorbent material that is applied to a stone or other materials. A poultice can be used on surfaces other than stone. Poultices can be used on a variety of surfaces, including concrete, brick, wood, and even... Read More