US1995444A - Photographic printing emulsion - Google Patents

Photographic printing emulsion Download PDF

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Publication number
US1995444A
US1995444A US631272A US63127232A US1995444A US 1995444 A US1995444 A US 1995444A US 631272 A US631272 A US 631272A US 63127232 A US63127232 A US 63127232A US 1995444 A US1995444 A US 1995444A
Authority
US
United States
Prior art keywords
emulsion
salt
print
ccs
silver
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 - Lifetime
Application number
US631272A
Other languages
English (en)
Inventor
Berry William Ambler
Storr Bertram Vincent
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.)
Ilford Imaging UK Ltd
Original Assignee
Ilford 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
Application filed by Ilford Ltd filed Critical Ilford Ltd
Application granted granted Critical
Publication of US1995444A publication Critical patent/US1995444A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03C1/49—Print-out and photodevelopable emulsions
    • 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
    • G03C1/09—Noble metals or mercury; Salts or compounds thereof; Sulfur, selenium or tellurium, or compounds thereof, e.g. for chemical sensitising

Definitions

  • This invention comprises improvements in or relating to photographic printing emulsions which may be applied to a paper or any other preferred support, and which contain a silver halide, preferably silver chloride.
  • One object of the present invention is to provide a photographic printing paper which will not suffer from the above liability towards deterioration and which at the'same time, will, on
  • the invention provides a, print-out photographic emulsion in which the print-out properties are produced by the addition of a soluble manganese saltinstead of a solublesilver salt to an emulsion whereof the silver salt content is substantially insoluble in water, for example co sists exclusively of silver chloride.
  • the emulsion may also contain a" gold salt, preferably together with a lead salt and a thiocyanate, e. g. a thiocyanate of an alkali metal or of ammonium;
  • a thiocyanate e. g. a thiocyanate of an alkali metal or of ammonium
  • the addition of the gold salt to the emulsion renders the latter, as is known, selftoning.
  • the addition of the lead salt increases the amount'o-f brilliancy of the toning, while the thiocyanate assists in controlling the quality of tone.
  • the emulsion is prepared by the precipitation of silver chloride from a solution of a soluble silver salt (silver nitrate) by the addition of a solution of manganese chloride.
  • printing paper asused in this specification with reference to the material prepared according to the invention implies a paper of the type normally known as a.printing-.out paper, but need not necessarily be employedias such, as it is possible to use the paper by a development method.
  • the method according to the invention may consist in exposing a paper bearing an emulsion comprising an insoluble silver salt or salts, a salt of manganese and.
  • a solution comprising gelatin, water, citric acid and silver nitrate was. made up at F. and to this was added a solution of manganese chloride in quantity more than sufiicient to precipitate all the silver in the form of silver chloride.
  • a solution of gold thiocyanate was prepared by the addition to a solution of gum arabic of gold chloride and ammonium thiocyanate, and this was then mixed with the gela includes a Gelatin Water 200 ccs. 2 /2N silver nitrate 10.0 ccs. 25% gold chloride (NaAuCl-l) 0.75 ccs. Gum arabic solution (6%) 5.0 ccs. 2 N ammonia 5.0 ccs. 2 N citric acid 7.5 ccs. 2%N manganese chloride (MnC12) 9.0 ccs. Ammonium thiocyanate (16 grms.
  • the following procedure may be followed in developing the print. After exposure (Which-may in some cases be just sufficient to show the outlines of an image) the paper is washed for one minute and then transferred to a developer of the formula:-
  • the developer should not contain any substantial proportion of sodium sulphite since this may have a detrimental action on the subsequent toning operation.
  • the toning bath may conveniently comprise a 30% solution of sodium thiosulphate to which may, if desired, be added a small proportion of ammonium thiocyanate.
  • the print may, if desired, be toned after removal from the developing bath by placing it in a solution of common salt and potash alum until the colour has reached the desired tone, the print then being removed and fixed in thiosulphate in the ordinary way.
  • the invention includes the manufacture of the emulsion as. described herein, paper and other material coated with that emulsion, and the special method for the production of the print. It will be appreciated that although the invention is particularly concerned with the preparation of a printing paper, other supports for the emulsion may be employed.
  • a photographic paper or other support bearing a print-out emulsion comprising a silver salt content which is substantially insoluble in water, a soluble salt of manganese, and a gold salt.
  • a photographic paper or other support bearing a print-out emulsion comprising a silver salt content which is substantially insoluble in water, a soluble salt of manganese and a lead salt.
  • a photographic paper or other support bearing a print-out emulsion comprising a silver salt content which is substantially insoluble in water, a soluble salt of manganese and a thiocyanate.
  • a photographic paper or other support bear ing a print-out emulsion comprising a silver salt content'which is substantially insoluble in Water, a soluble'salt of manganese, a gold salt, a lead salt and a thiocyanate of an alkali metal or ammonium.
  • a method of preparing a print-out emulsion which comprises the precipitation of silver chloride from a solution of a soluble silver salt by the addition of a solution of manganese chloride.
  • a photographic paper or other support bearing a print-out emulsion which has a silver salt content consisting mainly of silver chloride, which contains .self-toning ingredients and in which the print-out properties are produced by a. content of a soluble manganous salt.
  • a photographic paper or other support bearing a print-out emulsion which has a silver salt content substantially insoluble in water, which contains self-toning ingredients and in which the print-out properties are produced by a content of manganous chloride.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Paper (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
US631272A 1931-09-03 1932-08-31 Photographic printing emulsion Expired - Lifetime US1995444A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1995444X 1931-09-03

Publications (1)

Publication Number Publication Date
US1995444A true US1995444A (en) 1935-03-26

Family

ID=10895578

Family Applications (1)

Application Number Title Priority Date Filing Date
US631272A Expired - Lifetime US1995444A (en) 1931-09-03 1932-08-31 Photographic printing emulsion

Country Status (3)

Country Link
US (1) US1995444A (en, 2012)
BE (1) BE390776A (en, 2012)
DE (1) DE609303C (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432908A (en) * 1942-07-22 1947-12-16 Rca Corp Cathode-ray target and method of manufacture
US2624674A (en) * 1946-06-29 1953-01-06 Eastman Kodak Co Photographic emulsion sensitized with gold compounds and sulfur sensitizers
US3241971A (en) * 1961-08-01 1966-03-22 Eastman Kodak Co Photographic silver halide emulsions
US3854952A (en) * 1973-09-19 1974-12-17 Western Electric Co Photosensitive silver halide composition

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1018552A (en) * 1961-03-02 1966-01-26 Denis Edward Peter Hayward Improvements relating to photo-sensitive silver bromide papers or films of the print-out type

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432908A (en) * 1942-07-22 1947-12-16 Rca Corp Cathode-ray target and method of manufacture
US2624674A (en) * 1946-06-29 1953-01-06 Eastman Kodak Co Photographic emulsion sensitized with gold compounds and sulfur sensitizers
US3241971A (en) * 1961-08-01 1966-03-22 Eastman Kodak Co Photographic silver halide emulsions
US3854952A (en) * 1973-09-19 1974-12-17 Western Electric Co Photosensitive silver halide composition

Also Published As

Publication number Publication date
BE390776A (en, 2012)
DE609303C (de) 1935-02-12

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