On the physical and visual state of 100-year-old Lippmann color photographs

In 1891 Gabriel Lippmann demonstrated a photographic process which records full color images on black and white emulsions. It is closely related to Denysiuk's reflection holography technique, which he named after Lippmann. After a historical introduction I will speak on the physical state and visual appearance of Lippmann-process color images produced at the tarn of the century by Lippmann and a limited number of other practitioners, Images made on albumin, collodion and gelatine will be discussed, based on my examination of more than 400 images held in public and private collections. Examples of old original images (and some new work) will be shown, It is possible to conclude that, if properly executed, such images will be stable in their beautiful rendition of color and extremely high resolution almost indefinitely.