GB253380A - Improvements relating to the production of photographs on paper parchment and the like - Google Patents

Improvements relating to the production of photographs on paper parchment and the like

Info

Publication number
GB253380A
GB253380A GB1889125A GB1889125A GB253380A GB 253380 A GB253380 A GB 253380A GB 1889125 A GB1889125 A GB 1889125A GB 1889125 A GB1889125 A GB 1889125A GB 253380 A GB253380 A GB 253380A
Authority
GB
United Kingdom
Prior art keywords
acid
silver salt
paper
dishes
developer
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
GB1889125A
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 GB1889125A priority Critical patent/GB253380A/en
Publication of GB253380A publication Critical patent/GB253380A/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
    • G03C1/494Silver salt compositions other than silver halide emulsions; Photothermographic systems ; Thermographic systems using noble metal compounds
    • G03C1/496Binder-free compositions, e.g. evaporated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

253,380. Jelley, E. E. July 24, 1925. Sensitized films and papers; developing and fixing. -For sensitizing paper, parchment &c. without any gelatin or other colloidal substance a soluble silver salt, the silver of which is chemically combined with one or more of the three higher halogens, is used in conjunction with a water soluble, non-volatile, crystallisable, weak acid. Silver chlorate, perchlorate, bromate, dichlorobenzoate and other salts are instanced, and for the acid citric, tartaric and 2.3.6 trichlorobenzoic acid. The acid solution may be applied to the surface separately, and an alcoholic solution used. Development is effected by organic reducing agents such as metol, pyro, hydroquinone, but amidol is not suitable. If the coating does not contain sufficient silver salt to give the necessary image density (e.g. less than .0005 grms per sq. cm.) the exposure is shortened, and a soluble silver salt (e.g. nitrate, chlorate, but not permanganate or nitrite which destroy the developer), is added to the developer, the hydrogen-ion concentration of which should be between .0001 and .01. A fixing bath of hypo and bicarbonate is specified, but an acid fixing bath may be used. Various tones may be obtained by varying the exposure and the treatment. Detailed particulars of methods of preparing the paper and using it are given. Clean developing dishes are essential, and dishes of vulcanite porcelain or papier machÚ should be coated with paraffin wax.
GB1889125A 1925-07-24 1925-07-24 Improvements relating to the production of photographs on paper parchment and the like Expired GB253380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1889125A GB253380A (en) 1925-07-24 1925-07-24 Improvements relating to the production of photographs on paper parchment and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1889125A GB253380A (en) 1925-07-24 1925-07-24 Improvements relating to the production of photographs on paper parchment and the like

Publications (1)

Publication Number Publication Date
GB253380A true GB253380A (en) 1926-06-17

Family

ID=10120193

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1889125A Expired GB253380A (en) 1925-07-24 1925-07-24 Improvements relating to the production of photographs on paper parchment and the like

Country Status (1)

Country Link
GB (1) GB253380A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2265020A (en) * 1992-03-13 1993-09-15 Ilford Ag Silver halide emulsions with increased speed

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2265020A (en) * 1992-03-13 1993-09-15 Ilford Ag Silver halide emulsions with increased speed

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