They are affected by moisture - ones needs to keep them dry with the humidity at an ideal constant level.
but for art history, they arent affected because the paint dries with the plaster on the wall, effectively making the fresco part of the wall
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frescoes
frescoes
it is very cool and breezy
Ambrigio Lorenzeth
Depends which one you are talking about. His frescoes are of course in Italy, on the very roof he painted them on. Hard to move those!