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Most old photo papers used silver in their emulsions.As time passes this silver tends to migrate to the surface of the print creating tell-tale metallic patches.Sometimes a photographer might expose a logo onto the image or hand stamp a name to the back of the card. Numbering was an essential way of keeping tract of large inventory.The presence of a photographers name is not a definite indication of when a card was made or even who made it.Observing this shiny crust, no mater what the color, is a quick and sure way of telling if you are looking at a real photo.A common problem with real photo postcards is that they are often devoid of any descriptive text.
At other times a studio might buy out the negative inventory of older photographers and reprinted their images under the current studio name.
Many other brands of photo paper were also manufactured in Europe but rarely left the continent.
The very first photographs made were on printing out paper.
At least 450 different real photo postcard backs can be found but as of this time there is a lack of accurate information regarding all their dates of use, or they were used in very limited quantities.
Kodak controlled 80% of the paper market with their brands Artura, Azo, Aristo, EKC. Cyko by Ansco, Argo by Defender, and Kruxo by Kilborn comprised most of the remaining market.Today there are many real photo postcards of unknown origin and date.