GB547883A - Improvements in or relating to photographic light-sensitive material - Google Patents

Improvements in or relating to photographic light-sensitive material

Info

Publication number
GB547883A
GB547883A GB333941A GB333941A GB547883A GB 547883 A GB547883 A GB 547883A GB 333941 A GB333941 A GB 333941A GB 333941 A GB333941 A GB 333941A GB 547883 A GB547883 A GB 547883A
Authority
GB
United Kingdom
Prior art keywords
contrast
emulsion
colour
sensitized
sensitizing dye
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
GB333941A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB333941A priority Critical patent/GB547883A/en
Publication of GB547883A publication Critical patent/GB547883A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/035Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00Photosensitive materials
    • G03C1/005Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/035Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein characterised by the crystal form or composition, e.g. mixed grain
    • G03C2001/03564Mixed grains or mixture of emulsions

Landscapes

  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (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)

Abstract

547,883. Photographic multi-contrast material. RENWICK, F. F., and WALLER, C. March 11, 1941, No. 3339. [Class 98 (ii)] Light-sensitive multi-contrast material comprisea support coated with a mixture of a non-coloursensitized part of a gelatino-silver halide emulsion and at least one fully colour-sensitized part of the same emulsion, the sensitizing dye or dyes employed being present in total quantity less than would be necessary to impart optimum colour sensitivity to the whole of the mixed emulsion and being such that the resulting photographic material yields developed images of different contrast between wide limits according to the light used'for exposure. The ratio of the maximum to the minimum gamma value of the developed images obtainable from the photographic material is 5:4 or greater. The smaller the fraction of the mixed emulsion which is fully colour-sensitized, the wider are the extremes of contrast obtainable. Increase in the quantity of sensitizing dye raises the speed, but reduces the extremes of contrast obtainable. Exposure to blue light yields developed images of greater contrast. The original non-colour-sensitized emulsion should have high contrast characteristics. The sensitizing dye may be added before or after washing or before or after digestion. In example (1), sensitizing dye is added to a high-contrast gelatino-silveriodobromide emulsion which is then mixed with a non-sensitized portion. Tables are given of the results obtained on exposure to blue light and to yellow light, using as sensitizing dye (a) 1:3:3-trimethylindolylidene - 2:4<SP>1</SP>-ethylidene -1<SP>1</SP>- phenyl-3<SP>1</SP>- methyl - pyrazole - 5<SP>1</SP> - one ; (b) 1 : 3 : 3 : 5 - tetramethylindolylidene - 2 : 41 - ethylidene - 1<SP>1</SP>- phenyl - 3<SP>1</SP> methylpyrazole - 5<SP>1</SP> - one ; (c) 1:1<SP>1</SP> - diethylpseudocyanine iodide ; and (d) 2:1<SP>1</SP> - diethyl - 4 - chlorthiapseudocyanine iodide in various quantities. Example (2) is similar, using as sensitizing dye (a) 1:1<SP>1</SP>- diethylpseudocyanine iodide ; (b) 2:1<SP>1</SP>-diethyl-4-methylselenapseudocyanine iodide ; (c) 1:3:3:5-tetramethylindolylidene-2:4<SP>1</SP>-ethylidene-1<SP>1</SP>-phenyl-3<SP>1</SP>-methylpyrazole-5<SP>1</SP>-one ; (d) 1:3:3- trimethylindolylidene - 2:41 - ethylidene - 11 - m - tolyl - 3<SP>1</SP> - methylpyrazole - 5<SP>1</SP> one ; (e) 2:2<SP>1</SP> - diethyl - 5:6:5<SP>1</SP>:6<SP>1</SP>- dibenz - 7:7<SP>1</SP> ethylenethiacarbocyanine - p - toluenesulphonate ; (f) 1 - phenyl - 3 - methyl - 4 - (# - N - methyldihydrobenzthiazolylidene)- pyrazole - 5 - one ; and (g) 2 - thio - 3 - ethyl- 4-keto- 5 - (# - N - methyldihydrobenzoxazolylidene) - isopropylidenetetrahydrothiazole in various quantities. Example (3) is similar, using blue and red light and the panchromatic sensitizing dyes 2:2<SP>1</SP>-diethyl-8- methylthiacarbocyanine bromide and 2:21-8-triethyl- 4:41-d'ichlorthiacarbocyanine chloride. Example (4) is similar, using a silver chlorobromide emulsion and the sensitizing dyes 1:3:3:5-tetramethylindolylidene- 2:4<SP>1</SP>- ethylidene - 1<SP>1</SP> - phenyl - 3<SP>1</SP> - methylpyrazole - 5<SP>1</SP>- one and 2:1 - diethyl - 4 - chlorthiapseudocyanine iodide in various quantities. Specification 494,088 is referred to. According to the Provisional Specification, a colour sensitized emulsion may be mixed with a non-colour sensitized emulsion of the same or similar contrast.
GB333941A 1941-03-11 1941-03-11 Improvements in or relating to photographic light-sensitive material Expired GB547883A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB333941A GB547883A (en) 1941-03-11 1941-03-11 Improvements in or relating to photographic light-sensitive material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB333941A GB547883A (en) 1941-03-11 1941-03-11 Improvements in or relating to photographic light-sensitive material

Publications (1)

Publication Number Publication Date
GB547883A true GB547883A (en) 1942-09-16

Family

ID=9756451

Family Applications (1)

Application Number Title Priority Date Filing Date
GB333941A Expired GB547883A (en) 1941-03-11 1941-03-11 Improvements in or relating to photographic light-sensitive material

Country Status (1)

Country Link
GB (1) GB547883A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219723A (en) * 1991-10-10 1993-06-15 Eastman Kodak Company Green sensitizing dyes for variable contrast photographic elements
US5376523A (en) * 1991-10-10 1994-12-27 Eastman Kodak Company Method for controlling characteristics curve shape for variable contrast photographic elements

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5219723A (en) * 1991-10-10 1993-06-15 Eastman Kodak Company Green sensitizing dyes for variable contrast photographic elements
US5376523A (en) * 1991-10-10 1994-12-27 Eastman Kodak Company Method for controlling characteristics curve shape for variable contrast photographic elements

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