[2] The first workshop took place from 15–18 January 2019; the second workshop with PhD and graduate students was part of the Dutch Graduate School Onderzoeksschool Kunstgeschiedenis in context of the Materials & Materialiy in Art History Course, 14 March 2019. The Artechne team also partnered up with conservators of the Heritage Department of the University of Antwerp who organized the one-week ROOHTS Summer School on Burgundian Black at Antwerp, Belgium, 1–5 July 2019.