Figure 11From: Micromorphological and chemical elucidation of the degradation mechanisms of birch bark archaeological artefacts Chromatograms obtained after extraction with CH 2 Cl 2 /MeOH of A) Sample 1, B) Sample 2, C) Sample 3 and D) Sample 4. I.S.1: internal standard hexadecane, I.S.2: internal standard tridecanoic acid and *instrument contamination.Back to article page