[89] See e.g., Judith H. Hofenk de Graaff, The Colourful Past: Origins, Chemistry and Identification of Natural Dyestuffs (London: Archetype Publ, 2004), 240; Dominique Cardon, Le monde des teintures naturelles (Paris: Belin, 2014), 332-346; Anna Hartl et al., “Searching for Blue: Experiments with Woad Fermentation Vats and an Explanation of the Colours through Dye Analysis,” Journal of Archaeological Science: Reports 2 (June 2015): 9–39; Ursula Klingelfuss-Schneider, “Processing of Indigo Plants and Dyeing with Indigo in Japan: Impressions of a Visit in Autumn 2000,” in Dyes in History and Archaeology, vol. 20 (London : Archetype, 2005), 121–26.