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Fig. 4 | Heritage Science

Fig. 4

From: Analysis of Poul Gernes’ painted folding doors at Herlev Hospital

Fig. 4

Chromatogram of a sample (S8) from the blue violet paint layer from Kiosk back. The peak marked I.S. is the internal standard (methyl ester of margaric acid, C17:0). The strong peak no. 5 corresponds to the dimethyl ester of ortho-phthalic acid and the minor peak no. 6 to the dimethyl ester of iso-phthalic acid. Methyl benzoate, peak no. 2, is most likely derived from fragmentation of the phthalic acid component. The methyl ester compounds of the monocarboxylic acids caproic (C6:0), capric (C10:0), palmitic (C16:0), oleic (C18:1), stearic (C18:0), and of the dicarboxylic acids suberic (2C8) and azelaic (2C9) are seen at peaks nos. 1, 3, 8, 9, 10, 4, and 7, respectively. The identified rosin compounds dehydroabietic acid (DHA), 7-oxo DHA, and 7-methoxy-tetradehydroabietic acid are seen at peak nos. 11, 12, and 14, respectively. Peak no. 13 is unknown. (m/z and R T values are listed in Additional file 1: Table S1)

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