Intonaco is important in fresco painting for what reason?

Intonaco is indeed crucial in fresco painting because it serves as the final layer for painting. In the fresco technique, artists first apply a rough base layer called the arriccio, and then they cover it with a smoother layer known as intonaco. This layer is where the actual pigments are applied. When the paint is applied to the wet intonaco, it binds to the surface as it dries, ensuring that the colors become an integral part of the wall. This process not only facilitates the creation of detailed and vibrant images but also influences the final texture and appearance of the artwork.

While other aspects such as color vibrancy, texture, and durability are certainly relevant in the context of fresco painting, the primary reason intonaco is significant is its role as the foundation for the painted image, which is applied directly to this smooth layer.