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Collotypes, which provide the finest detail of all printing methods are sometimes confused with real photo postcards.

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.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.Light energy alone, usually from the sun, reacted with the light sensitive chemicals on the paper’s surface to produce an image.They only needed to be fixed to preserve the exposed image.

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