Fig. 2From: Reconstructing Van Gogh’s palette to determine the optical characteristics of his paintsUHPLC-PDA results of husk extraction (a) Chromatograph and spectra of husks extracted with dimethyl sulfoxide, heated to 70 °C (b) after subsequent addition of 50 µl concentrated HCl/water/methanol (2:1:1) and heated to 100 °CBack to article page