The National Gallery Technical Bulletin is a unique record of research carried out at the National Gallery, London. Drawing on the combined expertise of curators, conservators, and scientists, it brings together a wealth of information about artists materials, practices, and techniques. Volume 27 is a special edition dedicated to Renaissance Siena and Perugia from 1490 to 1510. Contents of Volume 27: The Master of the Story of Griselda and Paintings for Sienese Palaces; The Madonna dei Loreto An Altarpiece by Perugino for Santa Maria dei Servi, Perugia; Working with Perugino: The Technique of an Annunciation attributed to Giannicola di Paolo; Gilding and Illusion in the Painting of Bernardino Fungai. Details of the contents of this and all volumes can be found at http: //www.nationalgallery.co.uk/technicalbulletin."