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
Sistine Chapel Choir "Any kind of guerilla action against Vatican II does not produce good fruits. The council's principles by now are untouchable." In 2010, Massimo Palombella, a Salesian priest, was appointed to replace Liberto as head of the choir. In September 2015, Deutsche Grammophon released a CD recorded in Sistine Chapel with the choir, the very first recording allowed there. Authorised by Pope Francis, he ruled that profits from sales of the album must be used for charity purposes only. On September 26, 2017, the Sistine Chapel Choir made their first visit to Canada, hosted by St. Michael's Choir School, at St.