Sistine Chapel ceiling of the Sistine Chapel. At the outset, the plaster, "intonaco", began to grow mold because it was too wet. Michelangelo had to remove it and start again. He then tried a new formula created by one of his assistants, Jacopo l'Indaco, which resisted mold and entered the Italian building tradition. Because he was painting "fresco", the plaster was laid in a new section every day, called a "giornata". At the beginning of each session, the edges would be scraped away and a new area laid down. The edges between "giornate" remain slightly visible; thus, they give a good idea of
Descent from Mount Sinai (Sistine Chapel) it: the position of some of them, painted from behind, was usually used for negative characters, such as Judas Iscariot in the "Last Supper". Once seeing that, Moses, in the center, gets angry and breaks the Tables on the ground. On the right background is the punishment of the idolatrous and the receiving of the new Tables. Joshua, in the blue and yellow, appears with Moses. Descent from Mount Sinai (Sistine Chapel) The Descent from Mount Sinai is a fresco by the Italian Renaissance painter Cosimo Rosselli and his assistants, executed in 1481–1482 and located in the Sistine Chapel, Rome.