Figure 4From: Analytical pyrolysis with in-situ silylation, Py(HMDS)-GC/MS, for the chemical characterization of archaeological and historical amber objectsComparison between the two pyrograms of the disc from the Apollonia site. Pyrogram a) corresponds to the external sample, pyrogram b) corresponds to the bulk area. The dotted line highlights the part of the diterpenes between 40–50 minutes.Back to article page