Fig. 9From: Unmasking a wild man: scientific analysis of Bertoldo di Giovanni’s Shield Bearer in The Frick CollectionPy-GC/MS chromatogram obtained upon derivatization with TMAH of sample S1, i.e. a scraping of the black organic coating. Compounds identified in the chromatogram suggest the presence of beeswax, an oil or mixture of oils, and a sulfur-containing materialBack to article page