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Table 2 The relative contents of the main PAHs in the modern pine wood ink (PM), lamp soot ink (LM), carbon black (CB) and the ink used in the historical rubbings (RM) by Py-GC/MS analysis

From: Characterization and identification of Chinese historical rubbings preserved in Wuyuan Museum by Pyrolysis–Gas Chromatography/Mass Spectrometry

PAHs Sample
PM LM CB RM ± SD
S1 area(%) (m/z 178) 13.9 14.5 71.4 27.0 ± 1.7
S2 area(%) (m/z 202) 27 34.3 9.8 17.8 ± 1.5
S3 area(%) (m/z 202) 28.9 34.7 9.1 20.1 ± 1.8
S4 area(%) (m/z 228) 10 3.8 0.0 11.3 ± 1.3
S5/S6 area(%) (m/z 252) 20.2 12.5 9.5 22.2 ± 1.8