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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 powdery deposit of salts which forms on the surface of bricks and mortar. It is usually white but efflorescence may be yellow, green or brown.ater allowed to enter uncovered cavity walls during construction is likely to cause efflorescence so brickwork must be protected from water entry during construction. Persistent efflorescence should be taken as a warning that water is entering the wall through faulty copings, flashings, or pipe leakage.