Minnesota Mining and Manufacturing Company

Luigi Valbusa

Paolo Beretta

Andrea Quaglia

Enzo Coraluppi

Mario Tavella

Direct positive photographic elements are disclosed employing internal latent image silver halide emulsions associated with developer autoxidation promoter agents constituted by 5 or 6 membered nucleus-containing heterocyclic compounds comprising an azomethine group, whose methine group is substituted with a 5-amino-1,2,4-triazolyl group, and/or copper complex compounds thereof. Preferably said direct positive photographic elements are multi-layer elements comprising internal latent image type type silver halide emulsion layers sensitized to different regions of the visible light and associated with image-dye providing compounds (photographic color couplers).

5-(1,2,4)-triazolyl-S-triazines

Process for forming direct positive images, direct positive silver

New cyanine dyes derived from di-halogen-benzoxazoles and benzothiazoles are desensitizers for silver halide negative emulsions and useful electron acceptor spectral sensitizers for direct positive silver halide emulsions.

Fogged direct positive silver halide emulsion containing a cyanine dye

New cyanine dyes, comprising at least one of the following nuclei (or derivatives thereof):

Growing community of inventors

Savona, Italy

Luigi Valbusa