“…However, the slowing down of the ageing process of historic stone relics is still mostly achieved through the use of organic coating treatments such as water-repellents, acid-repellents, and consolidants to preserve damaged historic stones or to protect un-damaged historic stone relics (Price, 1996;Striegel et al, 2003). Presently, the majority of materials that have been tried in the conservation of stone relics include epoxies (Cardiano et al, 2005), acrylics (Mazzola et al, 2003;Princi and Vicini, 2008), organic silicon compounds (Tarasov, 2001;Cardiano et al, 2005), fluorinecontaining polymers (Rizzarelli et al, 2001;Mazzola et al, 2003;Liang et al, 2009), etc. These materials can play a certain role in the protection of the stone relics, but they also have some inadequacies and defects, such as shorter life, poorer compatibility, or changes in the aspect of the treated historic stone sites (Melo et al, 1999;Borgia et al, 2001).…”