We are grateful to Michael White for his development of this In Focus, and to Carla Flack and Emma Richardson for their valuable contributions to the project.

Michael White would like to thank Doede Hardeman and Hans Janssen from the Gemeentemuseum Den Haag; Wietse Coppes from the Netherlands Institute for Art History; Caroline de Westenholz; and Thijs Visser.

Authors
Professor Michael White, Professor of History of Art, University of York
Carla Flack, Sculpture and Installation Art Conservator, Tate
Dr Emma Richardson, Associate Professor of Materials and Metrology, University College London

Series editor: Christopher Griffin, Convenor, Research Programmes and Publications, Tate
Project editor: Celia White, Senior Research Editor, Tate
Digital editor: Susannah Worth, Digital Editor (Research), Tate
Picture researcher: Arthur Goodwin, Assistant Research Editor, Tate