JAIC 1996, Volume 35, Number 1, Article 2 (pp. 09 to 21)
JAIC online
Journal of the American Institute for Conservation
JAIC 1996, Volume 35, Number 1, Article 2 (pp. 09 to 21)

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.


Copyright 1996 American Institute for Conservation of Historic and Artistic Works