Spike Bucklow is the Senior Research Scientist at the Hamilton Kerr Institute, University of Cambridge. He is author of ‘The Alchemy of Paint’ (2009) and ‘The Riddle of the Image’ (Spring, 2014), both about the meaning of materials in art.

Onya McCausland is an artist currently undertaking a PhD at the Slade School of Fine Art on the origins of earth colours and their contemporary significance in painting.

Ruth Siddall is a geoarchaeologist, who applies analytical techniques from the field of Earth sciences to further the understanding of cultural material, primarily pigments, construction and decorative stone, ceramics and plasters.

Jo Volley is a Senior Lecturer at the Slade School of Fine Art, UCL and co-director of the Material Research Project.