Fig. 1From: A comparative study of aged and contemporary Chinese herbal materials by using delayed luminescence techniqueHistoric herbal materials used in this study. a Display cabinets of historical herbal medicine in Utrecht Botanical Gardens. b Historic collections of Zingiber officinale (Sample ID Z.o_1900) in Utrecht Botanical Gardens. c Historic Curcuma aromatica collection (Sample ID C.a_1900) in Utrecht Botanical Gardens. d Historic Alpinia officinarum rhizome (Sample ID A.o_1900) at Utrecht Botanical Gardens. e Historic Glycyrrhiza glabra root (Sample ID G.g_1929) in Naturalis Biodiversity CenterBack to article page