What medium was used in the crucifixion masaccio?

Masaccio's "Crucifixion" is a fresco painted on the wall of the Brancacci Chapel in Florence. This medium involves applying water-based pigments onto freshly laid wet plaster, allowing the paint to become an integral part of the wall. The use of fresco allowed for vibrant colors and a sense of depth, contributing to the work's dramatic expression and realism.