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Whether on new constructions or renovation projects, a recurring façade issue is becoming increasingly common: a light-grey film on facing bricks. This alteration is not a temporary deposit such as cement haze or salt efflorescence, but the long-term consequence of a chemical process: brick greying, also known as gypsum formation on bricks. Brick greying does not only affect the aesthetic appearance of a building – it also significantly increases long-term façade maintenance needs.