• Condition reporting, researching the historical origins, authorship, date, type of photograph etc.
  • Duplicating negatives to conserve vital information in the case of actual or forecasted deterioration of base materials. Archives or museums that have extensive documentation on negative format might want to have duplicates made to have a back up in case of damage to the originals.
  • Below are reproductions of historical processes using original negatives or prints.
Salted paper print (as previously described)
Cyanotype print : a cyanotype is a photograph using the light sensitivity of certain iron salts. This type of print is popular because it is less expensive to make. The cyanotype process has been in use since the 1840’s.
Albumen print (as previously described)
Gum dichromate print : a gum print uses layers of pigments in a base of gum arabic on paper. The image looks like a water color or oil painting .
Printing out paper print (from Chicago Albumen Works) from a glass plate negative. (please refer to “photographic positives” for an explanation of the process).
(photograph from National Museum of Denmark)
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