Fig. 7From: Scientific analysis of tie luo, a Qing Dynasty calligraphy artifact in the Palace Museum, Beijing, ChinaUPLC chromatograms of the extracts of reddish pigments (a) and sappanwood (b) monitored at 275 nm and UV–Vis spectra of characteristic constituents (I, III: sappanwood Type A; II, IV: sappanwood Type C)Back to article page