INVESTIGATION OF A SURFACE TARNISH FOUND ON 19TH-CENTURY DAGUERREOTYPES
LEE ANN DAFFNER, DAN KUSHEL, & JOHN M. MESSINGER
2 DISCOVERY OF THE FLUORESCING TARNISH
During the initial stages of the Johnson Collection stabilization project, several techniques for examining and photographing daguerreotypes were investigated at State University College at Buffalo, including the use of both long-wave and short-wave ultraviolet. At this time a brilliant fluorescence was first observed on several unhoused daguerreotype plates viewed under short-wave ultraviolet illumination. It is interesting and important to note that the areas that fluoresce are not always discernible when the plate is examined under visible light.