Abstract
Binding media in samples taken from XIIth–XIIIth century polychrome sculptures in the Baptistery of Parma (Italy) were characterized by gas chromatography-mass spectrometry, after hydrolysis and derivatization procedures. The use of SE-52 capillary columns and the application of selected ion monitoring (SIM) allowed an increasing in the sensitivity and the ability to differentiate between animal glues, casein, egg and drying oils as components of the binders of paint and ground layers. Small amounts of material were enough for a satisfactory characterization.
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