Technical Bulletin 31

The National Gallery Technical Bulletin is a unique record of research carried out at the National Gallery. Drawing on the combined expertise of curators, conservators, and scientists, it brings together a wealth of information about artists' materials, practices, and techniques.

Volume 31 of the Technical Bulletin contains the following essays:

• In Search of Verrocchio, Painter and Master: The Virgin and Child with Two Angels
• Giorgione and not Giorgione: The Conservation History and Technical Examination of Il Tramonto
• The Virgin and Child with an Angel, after Francia: A History of Error
  
• Two Copies of Perugino's Baptism of Christ
• Rembrandt's Portrait(s?) of Frederik Rihel
• Mastic and Megilp in Reynold's Lord Heathfield of Gibraltar: A Challenge for Conservation

Ashok Roy is Director of Science at the National Gallery.