Beautifully produced & illustrated, this annual journal covers all aspects of the conservation, technical study, & care of the paintings in the National Gallery, London. Drawing on the combined expertise of curators, conservators, & scientists, it brings together a wealth of information about artists' materials, working practices, & techniques. Volume 20 is a special extended issue focusing on works by Van Dyck & Rubens in the National Gallery, & with an introductory essay on seventeenth-century painting practice in Antwerp & London & the influence of Italy. This Technical Bulletin is published to mark the 400th anniversary of Van Dyck's birth.