The invention relates to a sprayable suspension meant to be used for reinforcing and antimicrobial protection of inorganic surfaces of buildings and/or historic monuments. According to the invention, the suspension comprises 2...5 g/l active substance of hydroxyapatite type Ca(PO)(OH), where calcium has been partially replaced by Ag, in a Ca:Ag ratio of 0.66, dispersed in isopropyl alcohol solution 70%, exhibiting an antimicrobial activity against gram-negative strain of S. aureus and gram-positive strain of P. aeruginosa.
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