SCIENTIFIC INVESTIGATION OF AN IMPORTANT CORPUS OF PICASSO PAINTINGS IN ANTIBES: NEW INSIGHTS INTO TECHNIQUE, CONDITION, AND CHRONOLOGICAL SEQUENCE FRANCESCA CASADIO , COSTANZA MILIANI , FRANCESCA ROSI , ALDO ROMANI , CHIARA ANSELMI , BRUNO BRUNETTI , ANTONIO SGAMELLOTTI , JEAN-LOUIS ANDRAL , AND GWÉNAËLLE GAUTIER Conservation Department, The Art Institute of Chicago Dipartimento di Chimica, Istituto CNR di Scienze e Tecnologie Molecolari (ISTM-CNR) Dipartimento di Chimica, Centro SMAArt Musée Picasso, Antibes Independent conservation scientist The Musée Picasso in Antibes (France) houses a unique collection of  paintings and  works on paper by Pablo Picasso, completed during the fall of  by the artist, working on the same premises occupied today by the Museum. Picasso painted with readily available materials including oleoresinous enamel paints, brocement, wood panels, paper sheets, and re-used canvases. In this paper the results of an extensive campaign of scientic analysis of  of these works with both non-invasive and micro-invasive techniques are described. The project elu- cidated the full palette of the paintings, dispelling myths about their execution solely with the renowned brand of enamel paint Ripolin. The effective combination of elemental and spectroscopic methods of analysis enabled ne discriminations among various types of white enamel paint used by Picasso in Antibes. Because the artist appeared to have used such paints in chronological sequence, the precise identication of the type of white paint present on each of the works allowed the assignment of revised dates to some of the undated paintings. Important new infor- mation on surface coatings of wax and modern polymeric varnishes, as well as the widespread presence of metal soaps including zinc oxalates, was also uncovered. KEYWORDS: Picasso, oleoresinous paint, enamel paint, Ripolin, spectroscopic analysis, Antibes .INTRODUCTION The Musée Picasso in Antibes (MPA) has among its important holdings a unique collection of  paintings and  works on paper, executed by Picasso between September and November , and enhanced in  with an additional monumental painting (Ulysses and the Sirens, MPA inventory number ..). All the works were painted on-site by the artist while he was residing in the south of France. Picasso painted in the top oor of the building where the collection is now displayed, perched on a cliff over- looking the Mediterranean Sea. This remarkable unity of time and place endows the collection with historical importance. It also makes it an unparalleled location for the investigation of Picassos technique at a pivotal moment of renovation in the artists career: right at the close of World War II and with a young new companion by his side. A detailed photographic campaign carried out by Michel Sima, a sculptor, photographer, and friend of Picasso recently returned to France from concentration camps, documents the artist at work (Sima et al. ). Of notable interest in the photographs is the widespread presence of numerous cans of paints and, conversely, the apparent lack of rolled-up tubes of artists paints. These photo- graphs as well as documentary evidence (Gilot and Lake ) seem to support the notion that Picasso availed himself of readily available materials for his studio by the sea: brocement panels (a construction material available in thin sheets made of cement reinforced with asbestos bers), plywood supports, cans of paints acquired at the local drugstore, and a few painted canvases reclaimed from the storage © American Institute for Conservation of Historic and Artistic Works  DOI: ./Y. Journal of the American Institute for Conservation , Vol.  No. , 