GB464852A - An improved method of sensitizing photographic silver halide emulsions - Google Patents

An improved method of sensitizing photographic silver halide emulsions

Info

Publication number
GB464852A
GB464852A GB20413/35A GB2041335A GB464852A GB 464852 A GB464852 A GB 464852A GB 20413/35 A GB20413/35 A GB 20413/35A GB 2041335 A GB2041335 A GB 2041335A GB 464852 A GB464852 A GB 464852A
Authority
GB
United Kingdom
Prior art keywords
silver halide
improved method
halide emulsions
photographic silver
dyes
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
GB20413/35A
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
Publication of GB464852A publication Critical patent/GB464852A/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
    • G03C1/06—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein with non-macromolecular additives
    • G03C1/08—Sensitivity-increasing substances
    • G03C1/10—Organic substances
    • G03C1/12—Methine and polymethine dyes
    • G03C1/14—Methine and polymethine dyes with an odd number of CH groups

Landscapes

  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)

Abstract

Cyanine dyes derived from bithiazoles and biselenazoles are prepared by condensing quaternary ammonium salts in known manner to produce cyanine, isocyanine, pseudocyanine or symmetrical or unsymmetrical carbocyanine dyes. Condensations described in examples are (a) 2.6-dimethylbenzdithiazole methiodide is condensed with dimethyl formamidine in acetic anhydride, and with 2-iodoquinoline in alcoholic potash; (b) 2.7-dimethylbenzdithiazole methiodide is condensed with orthoformic ester in pyridine, and with 2-iodoquinoline in alcoholic potash. Reference is also made to the production by known means of pentamethine and heptamethine dyes.
GB20413/35A 1934-07-17 1935-07-17 An improved method of sensitizing photographic silver halide emulsions Expired GB464852A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE464852X 1934-07-17

Publications (1)

Publication Number Publication Date
GB464852A true GB464852A (en) 1937-04-23

Family

ID=6540309

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20413/35A Expired GB464852A (en) 1934-07-17 1935-07-17 An improved method of sensitizing photographic silver halide emulsions

Country Status (1)

Country Link
GB (1) GB464852A (en)

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