摘要:
A process for the formation of direct positive images comprising (1) imagewise exposing to light, a light-sensitive material comprising a photographic emulsion layer containing unfogged internal latent image type silver halide particles on at least one support, and (2) developing the light-sensitive material in the presence of a nucleating agent and at least one nucleation accelerator of general formula (I):A--(Y).sub.n R].sub.m (I)wherein A represents a group which is adsorbed by a silver halide; Y represents a divalent linkage group consisting of atoms or atomic groups selected from the group consisting of a hydrogen atom, a carbon atom, a nitrogen atom, an oxygen atom, and a sulfur atom; R represents an organic group containing at least one of a thioether group, an amino group, an ammonium group, an ether group, and a heterocyclic group; n represents an integer of 0 or 1; and m represents an integer of 1 or 2 to form direct positive images.
摘要:
A process for forming a direct-positive image by developing an imagewise exposed photosensitive material, having on a support at least one photographic emulsion layer containing nonprefogged silver halide grains capable of forming an internal latent image, in which development is carried out in the presence of a combination of a nucleating agent and at least one compound having at least one mercapto group selected from a tetrazaindene, a triazaindene, and a pentaazaindene. The hydrogen atom of which mercapto group may optionally be further substituted with an alkali metal atom or an ammonium group. The invention process provides rapid and consistent formation of direct-positive images having high maximum density and low minimum density.
摘要:
A process of forming a solid granular film is disclosed, which comprises dispersing solid granules into a liquid with the aid of a dispersant, removing the dispersant from the resulting dispersion to suspend the solid granules at the vapor-liquid interface, and transferring the solid granules onto a support, whereby high covering power is attained with respect to solid granules.
摘要:
A method for forming a direct positive image by the steps of (a) imagewise exposing a light-sensitive material including a support having thereon at least one photographic emulsion layer containing a nonprefogged silver halide capable of forming an internal latent image and (b) developing the exposed material in the presence of a nucleating agent containing a combination of at least one quaternary heterocyclic compound and at least one hydrazine compound. The resulting direct positive has sufficiently high maximum density and low minimum density, and satisfactory stability over time.
摘要:
A direct positive photo-sensitive material is described, wherein the material comprises at least one internal latent image-type silver halide emulsion layer containing core/shell-type silver halide grains consisting of substantially cubic or tetradecahedral grains mainly of the face (100) and being spectrally-sensitized with at least one sensitizing dye having the following formula: ##STR1## wherein R.sup.1 and R.sup.2 represent each a lower alkyl group substituted with a sulfonato, carboxyl or hydroxyl group, at least one of R.sup.1 and R.sup.2 being a sulfonatoalkyl group, R.sup.3 represents a hydrogen atom or a lower alkyl or substituted or unsubstituted phenethyl group, R.sup.4 represents a chlorine atom, a methoxy or ethoxy group or a hydrogen atom, R.sup.5 represents a chlorine atom or a phenyl, alkoxy or alkyl group, M.sup.+1 represents a cationic residue, m represents 0 or 1 with the proviso that when an inner salt is formed, m is 0.
摘要:
A method for forming a direct positive color image by image-wise exposing to light a light-sensitive material having at least one internal latent image type silver halide emulsion layer which is unfogged and color image-forming couplers on a support; either (1) subjecting the resulting material to fogging exposure to light and/or processing it with a nucleating agent before development, and then developing the resulting material with a surface developing solution containing an aromatic primary amine type color developing agent, or (2) developing the material after the image-wise exposure with a surface developing solution containing an aromatic primary amine type color developing agent under fogging exposure and/or in the presence of a nucleating agent; and bleach-fixing the resulting material, wherein the color developing solution contains at least one compound selected from the group consisting of compounds represented by the following general formulae (I), (II), (III) and (IV): ##STR1## wherein X represents --CO--, --SO.sub.2 -- or ##STR2## and R.sup.1 and R.sup.2 represents various familiar group; ##STR3## wherein R.sup.3, R.sup.4, R.sup.5 and R.sup.6 represent various familiar groups; ##STR4## wherein R.sup.7 and R.sup.8 represent various familiar groups; ##STR5## wherein Y represents a trivalent atomic group necessary for completing a condensed ring, m represents an integer of 0 to 4, and n represents an integer of 1 to 5.Stability of the color developing solutions with time lapse is excellent, which makes stable continuous process of color photographic light-sensitive materials possible over a long period.
摘要:
The present invention relates to a process for forming a direct positive color image, wherein bleaching time is reduced and color reproduction is not deteriorated. According to the present invention, there is provided a process for forming a direct positive color image comprising exposing a photosensitive material comprising, on a support, at least one photographic emulsion layer containing previously unfogged internal latent image-type silver halide grains and a color image-forming coupler, color-developing the same in the presence of a nucleating agent and/or fogging light, and then processing it with a processing solution having a bleaching effect, characterized in that a bleaching accelerator is incorporated into the processing bath having the bleaching effect or a pre-processing bath, or said bleaching accelerator is incorporated into the photosensitive material.
摘要:
A process for forming direct positive color photographic image is disclosed whereby a color photographic material having on a support at least one previously unfogged internal latent image-type silver halide emulsion layer and at least color forming coupler is developed, after imagewise exposure, with a surface color developer containing an aromatic primary amine color developing agent while applying thereto a fogging treatment, with or without the presence of a nucleating agent, before or during the development step, and bleaching and fixing (or blixing) the color photographic material, whereinthe pH of the surface color developer is not higher than 11.2,the color image forming coupler is a compound which is substantially non-diffusible and forms and releases a dye causing oxidative coupling with the aromatic primary amine color developing agent,and the surface of the silver halide in the internal latent image-type silver halide has been gold-sensitized.
摘要:
A silver halide photographic material comprising a support having thereon at least one light-sensitive silver halide photographic emulsion layer, wherein at least one layer selected from the emulsion layer and other hydrophilic colloid layers contains at least one alkynyl substituted heterocyclic quaternary ammonium salt represented by the following general formula (I): ##STR1## wherein Z represents a non-metallic atomic group necessary to form a substituted or unsubstituted 5-membered or 6-membered heterocyclic ring to which a aromatic ring or a heterocyclic ring may further be condensed; R.sup.1 represents a substituted or unsubstituted aliphatic group; X represents ##STR2## Q represents a non-metallic atomic group necessary to form a substituted or unsubstituted 4-membered to 12-membered non-aromatic hydrocarbon ring or substituted or unsubstituted non-aromatic heterocyclic ring; at least one of R.sup.1, a substituent for Z and a substituent for Q includes an alkynyl group; Y represents a counter ion necessary for charge balance; and n represents a number necessary to balance the charge.
摘要:
A process for forming a direct positive image which comprises image-wise exposing a light-sensitive material comprising a support having provided thereon at least one internal latent image type direct positive silver halide photographic emulsion layer, subjecting the selecting material to whole surface exposure before or during developing process, and then developing the resulting material in the presence of a quaternary salt type nucleating agent or a hydrazine type nucleating agent.The process is very high in the latitude for changes of expose amount, developing time, developing solution components, process temperature and the like and makes it possible to progress the development is a short time even in a low pH developing solution.