Direct positive processes utilizing silver halide internal latent image emulsions containing high concentration of heterocyclic thione antifoggants
Abstract
Abstract IN A KNOWN METHOD OFF SUCH WAVELENGTH TO PROVIDE PERMANENT RECT POSITVE IMAGES BY EXPOSING A LIGHT-SENSITIVE MATERIAL CARRYING A SILVER HALIDE EMULSION LAYER OF THE TYPE FORMINGA LATENT IMAGE PREDOMINANTLY IN THE INNER PART OF THE SILVER HALIDE GRAINS, I.E. A SO-CALLED INTERNAL IMAGE EMULSION, TREATING THE EXPOSED MATERIAL WITH A SURFACE DEVELOPER AND OVERALL EXPOSING THE MATERIAL DURING THIS TREATMENT TO ACTINIC LIGHT OF LOW INTENSITY, AN IMAGE HAVING MINIMUM DENSITY AND CONTRAST IS OBTAINED BY INCORPORATING WITHIN THE EMULSION LAYER AFOG-INHIBITING COMPOUND OF THE CLASS OF THE HETEROCYCLIC THIONE COMPOUNDS IN AN AMOUNT OF AT LEAST AOUT 0.1 MOLE PER 100 MOLE OF SILVER HALIDE AND WHICH IS SUBSTANTIALLY LARGER THAN NORMAL FOG-INHIBITING AMOUNTS. THE CONCEPT CAN BE APPLIED TO THE FORMATION OF BLACK AND WHITE IMAGES AS WELL AS TO COLORED IMAGES.
Inventors
- 👤 G Vanreusel
- 👤 Pee P Van
- 👤 Laet J De
Bibliographic Details
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