« Allégories de la fragilité ». Etude et conservation-restauration de six dessins de présentation de Diodore Rahoult pour les allégories peintes du musée-bibliothèque de Grenoble (vers 1870 ; Grenoble, musée de Grenoble) : recherche d'une méthode d'ident…

This master’s thesis is dedicated to the study and conservation-restoration of six drawings by Diodore Rahoult (1819-1874), preparatory to the allegories painted in the museum-library of Grenoble, and preserved at the museum of Grenoble. These drawings made with various graphic techniques, including pastel, on a transparent paper (presumably made from very refined fibers and impregnated with a resin), were executed around 1870. The type of mount and the extended light exposure of the drawings are largely responsible for the alterations they present. In order to treat the drawings, a scientific research was conducted to find an adhesive both compatible with pastel and with a paper impregnated with rosin. The difficulties we encountered in identifying the type of transparent paper used by the artist also led us to research a non-destructive method that could identify transparent papers with fluorescence induced by ultraviolet radiation.