Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
  • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
  • G03C5/40—Chemically transforming developed images
  • G03C5/42—Reducing; Intensifying
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
  • Y10S430/149—Lippmann

Definitions

• This invention concerns stable enhanced films and the production of enhanced and stable images in processed photographic films.
• enhancing of images or increasing of their light transmittance by treating silver images with an aqueous solution of mercuric iodide and relatively more soluble iodides, especially potassium iodide.
• Described herein are processes and solutions for treating developed and fixed plates and films, for enhancing the images, and for insuring that the enhanced images are stable.
• the old mercuric chloride bleaching process is similar to the initial step of an intensification process used with ordinary photographic film.
• the latter process is used when a film is underexposed, and when, after developing, a relatively small amount of silver gives a poor image.
• a mercuric chloride solution By treating the film with a mercuric chloride solution, more light sensitive salts are allowed to form in the area of the weak image, and upon further exposure to light, these light sensitive salts intensify the image. Before exposure to light, the film appears bleached or lightened because some of the metallic silver has been changed to a salt.
• Previous enhancement processes in Lippman photography have used this bleaching step to produce temporarily enhanced or more transparent images. of course, the end result of the intensification process produces the exact opposite of the desired eifect of enhancement in the Lippmann process.
• an image may be defined as a series of metallic laminae stacked transversely across the film.
• the laminae are spaced apart the distance of one-half of the wavelength of the light which created the image.
• Silver in the images may be in the form of small spheres or ovoids, with radially extending filaments.
• Bleaching refers to making images more transparent or more light transmittant. Images having improved light transmittance are referred to as enhanced images.
• This invention has, as one important objective, the provision of enhanced Lippmann films which are free from light sensitive salts.
• a second objective is the provision of a method for treating processed films having granular silver images to obtain enhanced images which are stable.
• a third objective is the provision of enhanced and stable images in photographic films.
• a further objective is the provision of improved solutions for treating silver images.
• This invention has, as an important purpose, the provision of solutions of mercuric iodide and soluble iodides for treating processed films.
• Another objective of this invention is the provision of solutions of mercuric iodides and alkali metal iodides for treating silver laminae.
• This invention has, as a further objective, the provision of mercuric iodide and potassium iodide solutions for treating processed films to result in enhanced and stable images.
• Other objectives will be apparent from the following description of this invention.
• the objectives of the invention are achieved by treating the silver images in a conventional manner, in an aqueous bath of relatively insoluble mercuric iodide and soluble iodides.
• alkali metal iodides are preferred as soluble iodides.
• Potassium iodide has proven particularly advantageous, probably due to its more favorable atomic diameter. While a theory of this invention is not necessary to an understanding of the invention, it would appear that potassium iodide enhances the solubility of the mercuric iodide. The potassium iodide further appears to facilitate the total replacement of silver with mercury and the complete removal of light sensitive salts from the film.
• the concentration of the solution is determined by the solubility of the mercuric and potassium salts, but these salts have been found to possess adequate solubility for achieving minimum intervals of treatment times.
• Lippmann images are formed in silver halide emusion on a photographic plate, and the plate is developed and fixed.
• Silver laminae in the plate are treated with an aqueous solution of one mole of mercuric iodide and six moles of potassium iodide.
• the plate is held in the solution for one hour, while the above stated chemical reactions may occur.
• Metallic mercury replaces silver in situ in the emulsion; silver forms a complex, and that complex and the remaining soluble mercury complexes wash out of the emulsion into the solution, leaving a stable Lippmann laminae.
• a developed enhanced and stabilized Lippmann film comprising mercury images and being free from silver images and from light sensitive silver salts and other metallic salts.
• the method of producing enhanced and stable photographic images comprising contacting the silver images in exposed and developed Lippmann-type film with a solution of mercuric iodide and of a soluble iodide for a time sufiicient in which to form and precipitate silver iodide and to form mercury images.
• the method of producing enhanced and stable images on exposed and developed Lippmann-type photographic silver image film comprising contacting said film with an aqueous solution of mercuric iodide and at least one relatively more water soluble iodide, for a period of time sufficient for at least partially changing silver images to silver iodide, complexing the silver iodide and replacing silver images with mercury images.
• the method of producing stable and enhanced exposed Lippmann-type photographic film containing silver images comprising contacting the images with a mercuric iodide and alkali metal iodide solution for a time suificient for at least partially changing silver images to silver iodide, complexing the silver iodide and replacing silver images with mercury images.
• the solution comprises a solution of mercuric iodide and potassium iodide.
• the solution comprises an aqueous solution of from /2 to 4 /2 moles of mercuric iodide and from 1 to 11 moles of potassium iodide and wherein the film is contacted for from about one to twenty hours.
• the solution comprises an aqueous solution of one mole of mercuric odide and six moles of potassium iodide and wherein the film is contacted for approximately one hour.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=24300592

Family Applications (1)

Country Status (8)

Cited By (1)

Citations (1)

• 1966
  • 1966-08-29 US US575505A patent/US3523790A/en not_active Expired - Lifetime
• 1967
  • 1967-04-04 FR FR8453A patent/FR1518277A/fr not_active Expired
  • 1967-04-13 BE BE696961D patent/BE696961A/xx unknown
  • 1967-04-18 GB GB17643/67A patent/GB1149598A/en not_active Expired
  • 1967-05-23 CH CH724567A patent/CH481400A/de not_active IP Right Cessation
  • 1967-05-27 ES ES341064A patent/ES341064A1/es not_active Expired
  • 1967-05-29 SE SE07510/67A patent/SE334814B/xx unknown
  • 1967-06-08 NL NL676707949A patent/NL149011B/xx not_active IP Right Cessation

Patent Citations (1)

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