Pink discoloration due to pigmented Archaea on the walls of the so-called Michelangelo's "secret room" (Medici Chapel, Florence, Italy)
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Pink discolorations are often observed on heritage buildings mainly in areas affected by salt weathering, where the development of halotolerant and halophilic microorganisms is favored. Part of these extremophilic microorganisms contains carotenoids, reason fo... ...
