Process for forming high-contrast silver images

Details Process for forming high-contrast silver images Process for forming high-contrast silver images

1978-01-23

1979-10-02

Kelley, Mary F.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 665, 96 95, 96107, 961145, 96 66HD, G03C 526, G03C 530, G03C 106

Patent

active

041697332

ABSTRACT:
Process for forming high-contrast silver images which comprises treating a light-sensitive silver halide photographic material provided with a hydrophilic colloidal layer containing a silver halide emulsion layer coated on a support and containing a tetrazolium compound, after imagewise exposure, with a developer and/or a processing solution prior to the developing, both of which contains at least a nitrogen-containing heterocyclic compound substituted with at least mercapto, thioketone or thioether group.

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