Print sulfurization instrument Research in Photographic Conservation
 

Print sulfurization instrument, constructed by Louis-Alphonse Davanne in 1864. Davanne was the vice president of the Société Française de Photographie from 1866 to 1876 and conducted research on the instability of silver images. This instrument was built to reproduce the mechanisms of silver print sulfurization. Photo: Collection of Société Française de Photographie.