who did a detailed analysis in 1933 to revealed that earlier restorers had " acted with a great deal of restraint " ?
Colalucci then talks of Michelangelo 's " rigorous maintenance " of " buon fresco " technique , contradicting this by describing the " a secco " retouchings that Michelangelo made to the shoulder of Eleazar and the foot of Reboam , both of which are in the lunettes .