Process for preparing film positive sheets for forging-by-copyin

Details Process for preparing film positive sheets for forging-by-copyin Process for preparing film positive sheets for forging-by-copyin

1986-08-18

1988-10-25

Dees, Jose G.

Radiation imagery chemistry: process, composition, or product th

Plural exposure steps

430 10, 430396, 430494, 430952, 101468, 283 57, 283 67, 283 93, 283902, G03C 500

Patent

active

047803975

ABSTRACT:
There is provided a process for preparing a film positive sheet for a forging-by-copying-proof print in which a first background image sheet is placed on a first latent image sheet, an unexposed film having a photosensitive membrane on the undersurface is placed on the background sheet to provide a primary three-layer film structure, the three-layer film structure is illuminated to partially expose the film, the first latent image and background sheets are replaced by second latent image and second background sheets, respectively, to provide a secondary three-layer film structure, the secondary three-layer film structure is illuminated to completely expose the partially exposed film and the second latent image and background sheets are removed from the secondary three-layer structure to thereby provide a film positive sheet for a forging-by-copying-proof print.

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patent: 4668597 (1987-05-01), Merchant

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