Technical Bulletin 25

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 25 of the Technical Bulletin contains the following essays:  

  
• Raphael’s Early Work in the National Gallery: Paintings before Rome
  
• Polidoro da Caravaggio’s Way to Calvary: Technique, Style, and Function
  
• Nicolas Lancret’s Four Times of Day
  
• The Effect of Relative Humidity on Artists’ Pigments, and Fading and Colour Change of Prussian Blue: Methods of Manufacture and the Influence of Extenders
  

Ashok Roy is Director of Science at the National Gallery.