GB626053A - Improvements in sensitive photographic materials - Google Patents

Improvements in sensitive photographic materials

Info

Publication number
GB626053A
GB626053A GB10022/46A GB1002246A GB626053A GB 626053 A GB626053 A GB 626053A GB 10022/46 A GB10022/46 A GB 10022/46A GB 1002246 A GB1002246 A GB 1002246A GB 626053 A GB626053 A GB 626053A
Authority
GB
United Kingdom
Prior art keywords
emulsion
silver
ammoniacal
silver salt
arsenites
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB10022/46A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ERIC FRED TEAL
Kodak Ltd
Original Assignee
ERIC FRED TEAL
Kodak Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE476292D priority Critical patent/BE476292A/xx
Application filed by ERIC FRED TEAL, Kodak Ltd filed Critical ERIC FRED TEAL
Priority to GB10022/46A priority patent/GB626053A/en
Priority to US732934A priority patent/US2500140A/en
Priority to FR953646D priority patent/FR953646A/en
Publication of GB626053A publication Critical patent/GB626053A/en
Expired legal-status Critical Current

Links

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
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/485—Direct positive emulsions
    • G03C1/48515—Direct positive emulsions prefogged

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

626,053. Photographic silver salt emulsions. KODAK, Ltd., TEAL, E. F., and DAVEY, E. P. April 1, 1946, No. 10022. [Class 98 (ii)] A developing-out silver salt emulsion is prepared by forming the sensitive silver salt in the presence of one or more of the following substances: arsenites (e.g. meta-arsenites), stannites, phosphites (e.g. meta- and hypophosphites), antimonites, hyposulphites and germanites. The emulsion may be of the ammoniacal or non-ammoniacal type, and may be a silver bromiodide or bromide emulsion. The emulsion may be coated immediately after ripening without washing, or may be washed and digested before coating. The emulsion may be an autopositive emulsion which is chemically fogged (e.g. with hydrazine, formaldehyde, hydroxylamine, or excess silver nitrate, or by extra digestion with or without sulphur sensitizers such as sodium thiosulphate), or light fogged. The substance may be added to the mixed halide solution used for forming the silver bromiodide emulsion, and the emulsion made in the usual manner using ammoniacal silver nitrate solution. With an autopositive emulsion, the formation of negative images on low exposure may be avoided by adding hydrazine hydrochloride or formaldehyde to the emulsion immediately after mixing the two solutions. The emulsion may be sensitized with sensitizing dyes, and a quantity of dye greater than the optimum may be used as in Specification 524,087. A developing agent such as hydroquinone may be added to the emulsion to permit of development merely by immersion in alkali, and the emulsion will thus be tanned imagewise, permitting the unhardened parts to be washed off.
GB10022/46A 1946-04-01 1946-04-01 Improvements in sensitive photographic materials Expired GB626053A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE476292D BE476292A (en) 1946-04-01
GB10022/46A GB626053A (en) 1946-04-01 1946-04-01 Improvements in sensitive photographic materials
US732934A US2500140A (en) 1946-04-01 1947-03-06 Sensitive photographic materials
FR953646D FR953646A (en) 1946-04-01 1947-09-30 Improvements to photographic products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10022/46A GB626053A (en) 1946-04-01 1946-04-01 Improvements in sensitive photographic materials

Publications (1)

Publication Number Publication Date
GB626053A true GB626053A (en) 1949-07-08

Family

ID=9959998

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10022/46A Expired GB626053A (en) 1946-04-01 1946-04-01 Improvements in sensitive photographic materials

Country Status (4)

Country Link
US (1) US2500140A (en)
BE (1) BE476292A (en)
FR (1) FR953646A (en)
GB (1) GB626053A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717833A (en) * 1952-05-12 1955-09-13 Sperry Rand Corp Direct positive emulsions
DE2224837A1 (en) * 1972-05-20 1973-11-29 Agfa Gevaert Ag PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367778A (en) * 1965-04-15 1968-02-06 Eastman Kodak Co Silver salt direct positive emulsion
US3816135A (en) * 1972-03-30 1974-06-11 Du Pont Direct positive silver halide emulsions through synergistic effects of fogging agents and organic reducing agents and/or their oxidized forms
DE2263246A1 (en) * 1972-12-23 1974-07-04 Agfa Gevaert Ag PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB462730A (en) *
US2005837A (en) * 1931-07-07 1935-06-25 Agfa Ansco Corp Manufacture of photographic emulsions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2717833A (en) * 1952-05-12 1955-09-13 Sperry Rand Corp Direct positive emulsions
DE2224837A1 (en) * 1972-05-20 1973-11-29 Agfa Gevaert Ag PHOTOGRAPHIC MATERIAL FOR THE PRODUCTION OF DIRECT POSITIVE PHOTOGRAPHIC IMAGES

Also Published As

Publication number Publication date
BE476292A (en)
FR953646A (en) 1949-12-09
US2500140A (en) 1950-03-07

Similar Documents

Publication Publication Date Title
US2751297A (en) Photographic emulsion layer containing a 3-pyrazolidone
US2592368A (en) Gelatine silver halide emulsion layer containing a dihydroxy diphenyl tanning developing agent
GB618061A (en) Improvements in sensitive photographic materials
US2588982A (en) Direct positive photographs using hydrazine in the emulsion
GB1387033A (en) Photographic direct-positive process and silver halide emulsion therefor
GB654631A (en) Improvements in and relating to the manufacture of photographic reversal images
GB1385039A (en) Photographic silver halide emulsions
US2497875A (en) Direct positive photographs using aerial fogging developer
US3033682A (en) Radiation-sensitive emulsions, elements, and processes for making same
GB778792A (en) Improvements in photographic reproduction processes and in developers and sensitive emulsions therefor
US3565632A (en) Hardening of gelatin
GB626053A (en) Improvements in sensitive photographic materials
US2456953A (en) Photographic reversal processes
US2230977A (en) Single solution photographic developing and fixing bath
US3023102A (en) Direct positive photographic emulsion
GB583648A (en) Improvements in photographic materials
US3420667A (en) Substituted quinones and dimine quinones as silver halide sensitizers
US3615511A (en) Surface developer with heterocyclic mercaptan for use on internal image emulsion
US3993490A (en) Direct positive photographic elements containing developers
US3458316A (en) Light sensitive silver halide emulsions
US3565620A (en) Photographic processing liquids and method of producing photographic images
US1582050A (en) Photographic print-out paper and prints made therefrom
GB803783A (en) Photographic materials
GB1178683A (en) Sensitive Silver Halide Photographic Materials
GB724001A (en) Photographic light sensitive silver halide emulsions and process using the same