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The simplicity of the process made it very attractive to amateur photographers.
Printing out papers fall into two categories, those coated with metallic salts, and those with coated with an emulsion.
Though most of us today are familiar with the concept of photo grain, this is mostly because we have experienced very large prints made from small 35mm negatives.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.Collotypes, which provide the finest detail of all printing methods are sometimes confused with real photo postcards.But even collotypes will exhibit a discernible grain when magnified.
- This process was invented in 1842, but its first known use for a postcard was in 1888.