PALO ALTO — Have you noticed white, powdery blotches on a stone, concrete, or tile surface in or around your home? This phenomenon is known as efflorescence, a common blight that can affect any masonry surface.
Efflorescence is seen most often in areas like joints and grout lines, and it can occur on both flat and vertical surfaces. It’s caused when moisture is drawn into a masonry material via a process known as capillary action—the same process that allows tree roots to transfer water from the soil up to the leaves. As moisture is drawn through the masonry material, it becomes saturated with minerals and salt. When the moisture finally reaches the outer surface of the material, Read more