Technical Bulletin 23

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 23 of the Technical Bulletin contains the following essays:

• The cleaning and restoration of Fra Angelico’s predella panels in the National Gallery
• The technique of Garofalo’s paintings in the National Gallery
• Two paintings by Charles-François Daubigny
• The blackening of vermilion: a study of the process through detailed analysis of paint samples
• The ‘MARC II’ digital camera and the scanning initiative at the National Gallery
• Enhanced image processing of X-rays
• Adhesives for the repair of early panel paintings: an evaluation of their physical properties

Ashok Roy is Director of Scientific Research at the National Gallery.