Dyes in History and Archaeology 37/40 : including papers presented at the 37th meeting held at the Faculty of Sciences and Technology, NOVA University of Lisbon, Campus Caparica 25-27 October 2018, the 38th Meeting held at the University of Amsterdam, 6-9 November 2019, and the 40th Meeting (online conference) hosted by the British Museum, London, 15-19 November 2021 ; edited by Jo Kirby; with the assistance of Christopher J. Cooksey, Vanessa Habib, Catherine Higgitt, Richard Laursen, Anita Quye, Terry Schaeffer, and Maarten van Bommel.