Photography is facing a new development almost as far-reaching as the change from tintypes to cellulose film. In the 103 years since Louis Jacques Daguerre invented the daguerreotype the use of light-sensitive silver salts has been the basis of photography. Now silver is being replaced by coal-tar dyes. So far this new dye-treated film has been used only to make duplicates of sound tracks from regular film. But scientists believe that dye-treated film for direct photography is in sight.
In ordinary photography silver bromide, emulsified in gelatin, is spread on a transparent cellulose-acetate...
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