GB403203A - Improvements in or relating to the production of photographic prints - Google Patents

Improvements in or relating to the production of photographic prints

Info

Publication number
GB403203A
GB403203A GB2797032A GB2797032A GB403203A GB 403203 A GB403203 A GB 403203A GB 2797032 A GB2797032 A GB 2797032A GB 2797032 A GB2797032 A GB 2797032A GB 403203 A GB403203 A GB 403203A
Authority
GB
United Kingdom
Prior art keywords
boric acid
sodium carbonate
relating
production
phloroglucine
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
GB2797032A
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.)
S C & P Harding Ltd
Original Assignee
S C & P Harding 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 S C & P Harding Ltd filed Critical S C & P Harding Ltd
Priority to GB2797032A priority Critical patent/GB403203A/en
Publication of GB403203A publication Critical patent/GB403203A/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
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/18—Diazo-type processes, e.g. thermal development, or agents therefor

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Color Printing (AREA)

Abstract

403,203. Developing photographic diazotype prints. LEUCH, W. P., and HARDING, Ltd., S. C. & P., Alliance Works, Denmark Hill, London. Oct. 7, 1932, No. 27970. [Class 98 (ii).] Diazotype prints are developed by means of a developer containing boric acid in the presence of an appreciable excess of an alkali carbonate, such as sodium carbonate. The weight of anhydrous sodium carbonate used may be four to seven times the weight of boric acid. Examples are given of developers containing (1) sodium carbonate, boric acid and phloroglucine and (2) potassium carbonate, boric acid, phloroglucine and resorcine. Specification 308,653, [Class 98 (ii), Photographic processes &c.], is referred to.
GB2797032A 1932-10-07 1932-10-07 Improvements in or relating to the production of photographic prints Expired GB403203A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2797032A GB403203A (en) 1932-10-07 1932-10-07 Improvements in or relating to the production of photographic prints

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2797032A GB403203A (en) 1932-10-07 1932-10-07 Improvements in or relating to the production of photographic prints

Publications (1)

Publication Number Publication Date
GB403203A true GB403203A (en) 1933-12-21

Family

ID=10268185

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2797032A Expired GB403203A (en) 1932-10-07 1932-10-07 Improvements in or relating to the production of photographic prints

Country Status (1)

Country Link
GB (1) GB403203A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657141A (en) * 1947-07-14 1953-10-27 Grinten Chem L V D Diazotype developer composition containing a potassium borate and process of using same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2657141A (en) * 1947-07-14 1953-10-27 Grinten Chem L V D Diazotype developer composition containing a potassium borate and process of using same

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