Method of processing silver halide materials
AssigneeEastman Kodak Company
InventorsAlan S. Fitterman, Robert E. Dickerson, Kenneth A. Duke
Life of this patent
Estimating the term…
Abstract
Photographic silver halide materials containing an incorporated black-and-white developing agent can be quickly and simply processed using unique processing compositions and methods. In a “two-step” method, the exposed material is contacted with an alkaline activator solution followed by a fixing composition. In a “one-step” method, activation and fixing are combined using a single alkaline activator-fixing composition containing the fixing agent. None of the processing solutions include black-and-white developing agents. The photographic silver halide materials are preferably radiographic silver halide materials that have a reflective support and provide black-and-white images that can be viewed without a light box.
Claims25
A method of providing a black-and-white image comprising:
- A) contacting an exposed black-and-white silver halide material containing an incorporated black-and-white developing agent with an activator composition having a pH of at least 10 and at least 0.05 mol/l of sulfite ions, and
- B) contacting said exposed silver halide material with a solution comprising a fixing agent other than a sulfite, said solution being free of black-and-white developing agents,
- wherein steps A and B are carried out simultaneously and said activator composition also comprises said fixing agent.
A processing kit comprising:
- a. an activator composition comprising at least 0.05 mol/l of sulfite ions and having a pH of at least 10, and
- b. a fixing composition comprising a fixing agent other than a sulfite, said fixing composition being free of black-and-white developing agents.
An activator-fixing composition that, in aqueous form, has a pH of at least 10, comprises at least 0.05 mol/l of sulfite ions and at least 0.05 mol/l of a fixing agent other than a sulfite, and is free of black-and-white developing agents.
A radiographic kit comprising:
- a. an activator composition comprising at least 0.05 mol/l of sulfite ions and having a pH of at least 10,
- b. a fixing composition comprising a fixing agent other than a sulfite, said fixing composition being free of black-and-white developing agents,
- c. a radiographic silver halide material comprising a support that has first and second major surfaces, said radiographic material having disposed on at least one support major surface, one or more hydrophilic colloid layers including a silver halide emulsion layer, said radiographic material also containing an incorporated black-and-white developing agent in one or more of said hydrophilic colloid layers, and
- d. a phosphor screen.
A radiographic kit comprising:
- a. an activator-fixing composition that, in aqueous form, has a pH of at least 10, and comprises at least 0.05 mol/l of sulfite ions and a fixing agent other than a sulfite, and is free of black-and-white developing agents,
- b. a radiographic silver halide material comprising a support that has first and second major surfaces, said radiographic material having disposed on at least one support major surface, one or more hydrophilic colloid layers including a silver halide emulsion layer, said radiographic material also containing an incorporated black-and-white developing agent in one or more of said hydrophilic colloid layers, and
- c. a phosphor screen.
A method of providing a black-and-white image comprising:
- A) contacting an exposed black-and-white silver halide material containing an incorporated black-and-white developing agent with an activator composition having a pH of at least 10 and at least 0.05 mol/l of sulfite ions, and B) contacting said exposed silver halide material with a solution comprising a fixing agent other than a sulfite, said solution being free of black-and-white developing agents,
- wherein steps A and B are carried out sequentially and said black-and-white silver halide material is a reflective radiographic silver halide material comprising a reflective support that reflects at least 80% of incident light, and having one or more photographic silver halide emulsion layers on only one side of said reflective support.
Dependencies are inferred from the claim text.