The authors would like to thank the colleagues who provided some
of the samples analyzed in this work: Jean-Philippe Echard (Laboratoire de Recherche et de Restauration, Museee de la Musique, Citee
de la musique) for accessing their collection, and Axelle Rougeulle
(UMR8167 Orient et Mediterranee, Textes – Archeologie – Histoire) for
allowing the sampling of some archeological artefacts .This work was
partly supported by the ANR project EXSUDARCH “EXSUDats et
goudrons vegetaux en ARCHeologie, chimie, fabrication et utilisations”.