GB1290156A - - Google Patents

Info

Publication number
GB1290156A
GB1290156A GB1290156DA GB1290156A GB 1290156 A GB1290156 A GB 1290156A GB 1290156D A GB1290156D A GB 1290156DA GB 1290156 A GB1290156 A GB 1290156A
Authority
GB
United Kingdom
Prior art keywords
emulsion
fog level
density
oct
silver halide
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
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 filed Critical
Publication of GB1290156A publication Critical patent/GB1290156A/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)
  • Photographic Processing Devices Using Wet Methods (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

1290156 Silver halide emulsions EASTMAN KODAK CO 30 Oct 1969 [30 Oct 1968] 53147/69 Heading G2C [Also in Division G1] A method of controlling the fog level in a liquid silver halide emulsion comprises testing the fog level by optical density measurements in the infrared on a sample of the emulsion to which developer solution has been added and by comparing the rate of increase of the density with time with a standard rate, and temporarily raising or lowering the pH value of the emulsion for a period to produce optimum fog level. An apparatus for carrying out the above method comprises a temperature controlled mixing chamber 24 into which metered amounts of emulsion and developer are fed by sampler 12 and hose 38 respectively. A pump 28 circulates the liquid through narrow passage 30 between transparent windows 48, 50 to attenuate the infrared radiation from source 40 falling on photo-multiplier 46. A density-time curve is plotted and compared with a "standard" curve, Fig. 3 (not shown) to determine whether the fog level is at its optimum value.
GB1290156D 1968-10-30 1969-10-30 Expired GB1290156A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US77192568A 1968-10-30 1968-10-30

Publications (1)

Publication Number Publication Date
GB1290156A true GB1290156A (en) 1972-09-20

Family

ID=25093352

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1290156D Expired GB1290156A (en) 1968-10-30 1969-10-30

Country Status (4)

Country Link
JP (1) JPS5220852B1 (en)
BR (1) BR6913723D0 (en)
FR (1) FR2021886A1 (en)
GB (1) GB1290156A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55739B2 (en) * 1972-02-15 1980-01-09

Also Published As

Publication number Publication date
DE1954201A1 (en) 1970-05-14
FR2021886A1 (en) 1970-07-24
BR6913723D0 (en) 1973-01-18
JPS5220852B1 (en) 1977-06-07

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee