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Granite buildings of Braga show extensive saline contamination, mainly related to anthropogenic activities.G ypsum is the salt associated with the most intense and widespread decay, affecting both internal and external surfaces of buildings. More soluble salts such as thenardite, niter and halite are associated with decay of wall paint. Soluble salts also affect mortars, mostly by the disruption of mortar joints, but, in addition, there is evidence of chemical attack. The zoned distribution of decay indicates that salt concentration is strongly linked to decay.

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