Restoration of the Sistine Chapel frescoes smoke and exhaust fumes of the city, being "much dirtier than the ceiling proper". The building was a little unstable and had already shifted considerably prior to Michelangelo's work of 1508, causing cracking of the ceiling, the crack in the "Judith" pendentive being so large that it had to be filled with bricks and mortar before painting. The upper part of the ceiling provided Michelangelo an irregular surface due to cracks and water seepage. Continued ingress of water from the roof and from unroofed exterior walkways above the ceiling level had caused seepage which carried down salts from the building
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.