Afectacions per microorganismes
Les condicions ambientals extremes acostumen a provocar reacció amb els elements orgànics del paper i donen lloc a l’aparició de microorganismes identificables per les taques de color verdós o lila. Aquesta afectació provoca el deteriorament i la pèrdua de consistència del suport dels documents, i per a neutralitzar-la es requereix l’acció d’un conservador i restaurador.
Foto: Construcció del camí veïnal de Caldes de Montbui a Sant Feliu de Codines, 1855. Fons: Diputació de Barcelona. (CAT AGDB B-7015)
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