The National Gallery Technical Bulletin is a unique record of research carried out at the National Gallery, London. Published annually, and beautifully produced and illustrated, it covers all aspects of the conservation, technical study and care of the paintings in the collection. Drawing on the combined expertise of curators, conservators and scientists, it brings together a wealth of information about artists' materials, working practices and techniques. The Technical Bulletin is an invaluable resource for art historians, collectors, museum curators, and all those with an interest in old master paintings, as well as essential reading for conservators. Contents: A Virgin and Child in the Style of Albrecht Durer. The authors readdress the question of attribution of this picture in the light of new information on the underdrawing, painting technique, and materials, obtained during recent conservation treatment. The technique and materials of the Virgin and Child Enthroned with Saints by Michael Pacher, a fifteenth-century painter and sculptor from the Tyrol. A note on occurrences of the purple pigment fluorite. The discovery and identification of an original varnish on a panel by Carlo Crivelli. Lorenzo Monaco's Coronation of the Virgin: its restoration and presentation. The restoration of two panels by Cima from the Wallace Collection, London. Pollutant monitoring at the National Gallery: a review of past and present monitoring of the main pollutants that affect paintings, and the implications for works displayed at the National Gallery.