Granolithography

In granolithography , developed in the 1970s , a translucent carrier material is provided with a fine grain, asphalt dust or some other fine powder and copied onto film. This fine-grained, natural "grid" is placed between the halftone negative and the layer to be exposed. This elaborate printing technology is compared to the normal light pressure for high-quality facsimile prints much better suited.

See also: lithography , fine printing process