Method for the formation of photographic images
AssigneeKonishiroku Photo Industry Co., Ltd.
InventorsKouzi Ono, Mikio Kawasaki, Mariko Natori, Eiichi Sakamoto
Life of this patent
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Abstract
Photographic materials and photographic processes employing light sensitive silver halide particles, silver halide particles which are substantially non-light sensitive having been modified with a silver halide solubility reducing agent and internally fogged silver halide particles which are substantially non-light sensitive provide negative silver images of high contrast and high maximum density.
Claims10
A method for the formation of a negative photographic image comprising
- (a) imagewise exposing a silver halide photographic light sensitive material and
- (b) developing said material with a processing solution containing at least a developing agent for silver halide and an agent for dissolving metallic salt particles
- in which said photographic material has a support and at least one layer coated on one side having
- (a) light sensitive silver halide particles,
- (b) metallic salt particles which are substantially non-light sensitive and which are soluble in said processing solution, said metallic salt particles having been modified on the surface thereof with metallic salt solubility reducing agent, such that in its presence the solubility of the metallic salt at its surface is reduced below the metallic salt solubility in the absence of said solubility reducing agent and
- (c) internally fogged silver halide particles which are substantially non-light sensitive,
- and wherein said metallic salt particles are silver halide.
A silver halide photographic material comprising a support and at least one layer coated thereon having
- (a) light-sensitive silver halide particles,
- (b) silver halide particles which are substantially non-light sensitive and which are soluble in a processing solution, said silver halide particles having been modified on the surface thereof with a silver halide solubility reducing agent, such that, in the presence of said agent, the solubility of the silver haldide at its surface is reduced below the silver halide solubility in the absence of said solubility reducing agent, and
- (c) internally fogged silver halide particles which are substantially non-light sensitive.
A method for the formation of a negative photographic image comprising
- (a) imagewise exposing a silver halide photographic light sensitive material and
- (b) developing said material with a processing solution containing at least a developing agent for silver halide and an agent for dissolving metallic salt particles
- in which said photographic material has a support and at least one layer coated on one side having
- (a) light sensitive silver halide particles,
- (b) metallic salt particles which are substantially non-light sensitive and which are soluble in said processing solution, said metallic salt particles having been modified on the surface thereof with metallic salt solubility reducing agent, such that in its presence the solubility of the metallic salt at its surface is reduced below the metallic salt solubility in the absence of said solubility reducing agent and
- (c) internally fogged silver halide particles which are substantially non-light sensitive,
- and wherein said metallic salt particles are silver bromide or silver chloride particles which are not chemically sensitized.
Dependencies are inferred from the claim text.