Dating glass negatives - Photographic plate - Wikipedia


During the 1880s, the collodion process was largely replaced by gelatin dry plates —glass plates with a photographic emulsion of silver halides suspended in gelatin. The dry gelatin emulsion was not only more convenient, but it could also be made much more sensitive, greatly reducing exposure times.

Commonly slides are listed as hand painted but in fact they are printed. With the improvements of printing techniques on glass, mass produced slides became possible. This type of transfer slide was produced in the many thousands over a period from the mid-1800s to the 1920s or so, and shipped all over the world. Hundreds, if not thousands, exist.


Dating glass negatives

Dating glass negatives



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