 Prior to the restoration, the team spent six months investigating the composition and condition of the frescoes, questioning members of the team that had restored the frescoes in the 1930s and making a detailed scientific study to ascertain which solvents and methods were best employed upon particular painted surfaces.The first stage of the physical restoration was to re-attach any areas of the plaster surface (which was approximately 5 mm thick) that were in danger of separating and breaking away.This was done by injecting a polyvinylacetate resin.