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What is effloresence?
(source - BIA Tech Note 23)
Efflorescence is a crystalline deposit of water-soluble salts on the surface of masonry units. Efflorescence is generally not harmful to the brick - nor
is it toxic or a health hazard. The main problem with efflorescence is that it makes an otherwise beautiful masonry structure quite unsightly
Efflorescence is usually white in color; however, all white stains on brick masonry are not necessarily efflorescence. Also, certain vanadium and
molybdenum compounds, present in some ceramic units, may produce a green deposit, commonly referred to as "green stain". Occasionally, "brown stain" may occur, resulting from
deposits of manganese compounds.
Under certain specific circumstances and conditions, it is possible for the crystals of efflorescence to form within the bodies of the units. When
this occurs, it is possible that the pressure of crystallization and growth of the crystals may cause cracking and distress to the masonry.
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