Vintage postcard dating

01-Jan-2016 11:29 by 5 Comments

Vintage postcard dating

And of course any image that contain a regularly patterned series of dots is not a photograph at all but a ink printed image.

As time passes this silver tends to migrate to the surface of the print creating tell-tale metallic patches.

Observing this shiny crust, no mater what the color, is a sure and 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.

The printing of the photographer’s or manufacturer’s name on the back of real photos was an expensive proposition.

But even here the effect is more of a softening of detail than a observable texture.

Early real photo postcards are small by their very nature and since most were contact printed, not enlarged, there is no visible texture.

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.

lthough real photo postcards were made in a variety of ways, they hold one identifiable feature in common.

The tonalities of photos are completely continuous to the eye producing true greys, for they are created by the reaction of individual photosensitive molecules to light rather than the transfer of ink from a plate.

In printed images the grey areas are usually made up of black marks that are spaced to create the optical illusion of greys.

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.

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