US2001951A - Photographic printing emulsion and its production - Google Patents

Photographic printing emulsion and its production Download PDF

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Publication number
US2001951A
US2001951A US715779A US71577934A US2001951A US 2001951 A US2001951 A US 2001951A US 715779 A US715779 A US 715779A US 71577934 A US71577934 A US 71577934A US 2001951 A US2001951 A US 2001951A
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US
United States
Prior art keywords
emulsion
toning
development
silver
self
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
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US715779A
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English (en)
Inventor
Berry William Ambler
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Ilford Imaging UK Ltd
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Ilford Ltd
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Filing date
Publication date
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Publication of US2001951A publication Critical patent/US2001951A/en
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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
    • G03C1/06—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 emulsions of the development type.
  • Photographic emulsions may be divided into two main types.
  • One type comprises the printing-out emulsions which consist essentially of silver chloride together with an excess of a soluble silversalt such as silver nitrate or a silver salt of an organic acid, e. g. silver citrate, lactate, ,or oxalate. With such emulsions'an image is obtained simply by exposure to light.
  • the other type comprises" the development emulsions which consist chiefly of silver chloride, silver bromide or combinations thereof, and do not contain any soluble silversalts;
  • a development emulsion does not, even on prolonged exposure to light, give a useful visible image, but requires development after exposure (insuflicient in itself to give a visible image) to produce the useful visible image.
  • certain development emulsions including those of the so-called gaslight'type one usually obtains an image which is substantially black and it is known to incorporate substances in these emulsions or to vary theconditions' of development in order to modify the quality of the blackness of this image produced by. development.
  • tone or colour of such developed images may be modified: by treatment in a toning bath to give an image of substantially different chemical composition from that of the developed image, for example in a sulphide solution which gives sepia tones by conversion of the silver image into silver sulphide. It'is an object of the present invention to provide a development emulsion which has selftoning properties and produces upon development and fixation a toned image comparable with one obtained on printing out paper when printed and toned in the usual way.
  • British Patent No. I British Patent No. I
  • the present invention comprises a self-toning "development emulsion in which the light-sensitive "salt consists mainly or exclusively of silverlchloride without any soluble silver salts-and which contains self-toning ingredients rcomprising a and fixing.
  • the invention also includes a process for the production of a photographic development emulsion comprising forming an emulsion containing essentially gelatine and silver chloride precipitated in situ and then adding atoning agent.
  • the invention further; includes a method of producing a toned image which consists in ex-. posing to light a paper bearing a self-toning development emulsion, developing the exposed paper and finally toning and'fixing the image in one operation by immersing the print in a solution of sodium thiosulphate.
  • an essential ingredient of the emulsion is a salt of manganese; Further, the specification states that the emulsion is also amendableto'the production' of a seli-toned image by development It has now been found that the omission of themanganese salt in the preparation of such an emulsion, whilst destroying the printing out properties of the emulsion, does not impair the self-toning properties and that images producedby theaction of light onthese emulsions can be developed and subsequently toned in a fixingbath.
  • a preferred process for the manufacture of a self-toning development emulsion according to the present invention comprises forming an emulsion consisting essentially of silver chloride and gelatine by precipitating the silver chloride ingan emulsionaccording to the invention:
  • a solution comprising gelatine, water, citric :acidand silver nitrate was made up at 110 F.
  • Emulsification was effected inthe usual wayand the emulsion shredded. The emulsion was then washed for one hour in 6 changes of water and melted out at 110 F.
  • a gold solution was made up by adding ammonium thiocyanate to sodium gold chloride in the presence of gum arabic, the following proportions being employed:
  • V The volume was, made up to 350 ccs. This formula gives a slow emulsion which may be increased in speed by the addition of suitable amounts of the agents normally used for increasing speed, c. g. thiosinamine or sensitizing dyes.
  • the emulsion is coated on paper in the usual manner.
  • toning ingredients a i Conveniently the following procedure is adopted in preparing the print. After an exposure to artificial light, comparable in duration to that given to ordinary gaslight papers, for example, for 4 or 5 seconds to a 100 watt /2watt type lamp at a distance of six inches with a normal negative, the paper is'passed' direct, i. e. without preliminary Washing, into a developer of the formula:-
  • Adurol 25 gms. Sodium sulphite (crystals) 5 gms. Sodium carbonate (crystals) 10 gms. Potassium bromide 0.5 gms.
  • tone obtained depends upon the duration of ly warmertones can be obtained by using a weaker fixing bath of approximately 20% strength.
  • the actual tone may be modifiedby the addition of more or less thiocyanate to the fixing bath.
  • Still colder tones may be obtained if desired by treating the print after removal from the developing bath and before fixing,.in a solution of common salt with or without potash alum until the colour has reached the desired tone, the print then being removed and fixed in thiosulphatein the ordinary way, or alternatively common salt may be added 'to the fixing bath.
  • the manganese chloride is replaced by sodium, ammonium, lithium or strontium chloride, an emulsion of substantially the same properties will be obtained.
  • sodium, ammonium and lithium chlorides, or chlorides of other'metals which do not produce a scum of insoluble carbonate in the developer are employed, the complete process may be carried out with some measure of success even if the emulsion is not washed before the addition of the gold and other finals, and there is no preliminary washing of the print before development.
  • the toning process is not prevented by the presence of the nitrates of sodium, ammonium and lithium or the like, improved results are obtainable when these are removed.
  • Variation in the tone and in the rate of toning may be obtained by varying the amount and/or composition of the toning agents added to the emulsion.
  • a self-toning photographic development emulsion comprising mainly silver chloride but gredient and a gold salt and a lead salt as self- 2.
  • a self-toning photographic development emulsion comprising mainly silver chloride but no soluble silver salt as the light sensitive ingredient and a gold salt, a lead salt and a thiocyanate as self-toning ingredients.
  • a process for the production of self-toning photographic development emulsion comprising forming an emulsion containing essentially gelatine and silver chloride by precipitating the silver chloride from a soluble silver salt by means of a soluble chloride and then washing from the emulsion the non-silver salt formed by the reaction together with any excess soluble silver salts and soluble chloride, and then adding a solution containing gold salt and a lead salt as self-toning ingredients.
  • a process for the production of a self-toning photographic development emulsion comprising forming an emulsion containing essentially gelatine and silver chloride by precipitating the silver chloride in situ, washing from the emulsion any soluble salts, and adding to the emulsion as self-toning ingredients a gold solution made up by adding ammonium thiocyanate and a lead salt to gold chloride in the presence of gum arabic.
  • a method of producing a toned image which consists in exposing to light a paper bearing a self-toning photographic development emulsion comprising mainly silver chloride but no soluble silver salt as the light sensitive ingredient and a gold salt and a lead salt as self-toning ingredients, developing the exposed paper in a development solution to produce a reddish image and finally toning and fixing the image by immersing the print in a solution of sodium thiosulphate.

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  • 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)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Colloid Chemistry (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
US715779A 1933-03-22 1934-03-15 Photographic printing emulsion and its production Expired - Lifetime US2001951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2001951X 1933-03-22

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US2001951A true US2001951A (en) 1935-05-21

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US715779A Expired - Lifetime US2001951A (en) 1933-03-22 1934-03-15 Photographic printing emulsion and its production

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US (1) US2001951A (xx)
BE (1) BE402030A (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624674A (en) * 1946-06-29 1953-01-06 Eastman Kodak Co Photographic emulsion sensitized with gold compounds and sulfur sensitizers
US2663641A (en) * 1946-10-07 1953-12-22 Gevaert Photo Prod Nv Production of reversal images
US2712995A (en) * 1949-07-04 1955-07-12 Agfa Ag Process for the direct production of positive photographic images
US2733994A (en) * 1956-02-07 Method of photographic duplicating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2733994A (en) * 1956-02-07 Method of photographic duplicating
US2624674A (en) * 1946-06-29 1953-01-06 Eastman Kodak Co Photographic emulsion sensitized with gold compounds and sulfur sensitizers
US2663641A (en) * 1946-10-07 1953-12-22 Gevaert Photo Prod Nv Production of reversal images
US2712995A (en) * 1949-07-04 1955-07-12 Agfa Ag Process for the direct production of positive photographic images

Also Published As

Publication number Publication date
BE402030A (xx)

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