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Efflorescence is the stubborn problem that has caused confusion and trouble for masonry since the first time it appeared thousands of years ago on ancient masonry walls. Efflorescence is normally the white, powdery scum that can appear on masonry walls after construction but can also be brown green or yellow, depending on the type of salts.
Efflorescence is a crystalline deposit of water-soluble salts (usually white) on the surface of masonry. All masonry materials are susceptible to efflorescence.In a chemical analysis, water-soluble salts consisting of only a few tenths of one percent is sufficient to cause efflorescence on a masonry surface.The amount and character of salts of the deposits can vary widely, depending the nature of the soluble materials and the atmospheric conditions.n a chemical analysis, water-soluble salts consisting of only a few tenths of one percent is sufficient to cause efflorescence on a masonry surface. The amount and character of salts of the deposits can vary widely, depending the nature of the soluble materials and the atmospheric conditions.