Fig. 4
From: Development of a novel conservation treatment of stone monuments with bioactive nanocomposites
In situ experimentation. a Exterior of the San Leonardo di Siponto church (Manfredonia, Italy) with indication of the test areas. b Test areas. A1 untreated area; A2 cleaned area; B1 cleaned area treated with Silo111; B2 cleaned area treated with Estel1100; C1 cleaned area treated with Silo111/ZnO-NPs; C2 cleaned area treated with Estel1100/ZnO-NPs; D1 cleaned area treated with Silo111/Cu-NPs; D2 cleaned area treated with Estel1100/Cu-NPs