Frescoes resist moisture due to being painted on wet plaster, forming a chemically stable bond that makes them a part of the wall.
Frescoes are not affected by moisture because they are painted on wet plaster, allowing the paint to chemically bond with the plaster as it dries, making it a permanent part of the wall. The buon fresco technique, where pigment is applied to wet plaster, creates a stable bond that withstands moisture without requiring additional binders. Due to this chemical reaction, the pigment becomes fused with the wall, making frescoes resistant to moisture damage.
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