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Heritage Science
Fig. 3 | Heritage Science

Fig. 3

From: In search of Humboldt’s colors: materials and techniques of a 17th-century lacquered gourd from Colombia

Fig. 3

a HPLC-PDA chromatogram at λ = 350 nm obtained upon extraction in 4% BF3 in MeOH of sample S5, i.e. a small chip of untinted resin from the interior of the gourd, compared with b a chromatogram acquired in the same conditions from a reference sample of Elaeagia pastoensis boiled resin. Compounds identified in both chromatograms include luteolin, apigenin, and luteolin monomethylether or related derivative

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