Final answer:
True frescoes are painted on wet plaster using the buon fresco technique, making the pigment a permanent part of the wall.
Explanation:
True frescoes are painted using the buon fresco technique, which involves painting on wet plaster. The pigment is absorbed by the wet plaster and becomes a permanent part of the wall as it dries and reacts with the air. This technique is more stable and long-lasting compared to fresco secco, which is painting on dry plaster.
Learn more about Fresco painting techniques here:
https://brainly.com/question/40576148
