US2017295A - Photographic developer - Google Patents

Photographic developer Download PDF

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Publication number
US2017295A
US2017295A US739279A US73927934A US2017295A US 2017295 A US2017295 A US 2017295A US 739279 A US739279 A US 739279A US 73927934 A US73927934 A US 73927934A US 2017295 A US2017295 A US 2017295A
Authority
US
United States
Prior art keywords
pyrogallol
photographic developer
developer
ether
photographic
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
US739279A
Other languages
English (en)
Inventor
Schultes Hermann
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
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 Degussa GmbH filed Critical Degussa GmbH
Application granted granted Critical
Publication of US2017295A publication Critical patent/US2017295A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/29—Development processes or agents therefor
    • G03C5/30—Developers
    • 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
    • G03C5/26—Processes using silver-salt-containing photosensitive materials or agents therefor
    • G03C5/29—Development processes or agents therefor
    • G03C5/30—Developers
    • G03C5/3021—Developers with oxydisable hydroxyl or amine groups linked to an aromatic ring

Definitions

  • pyrogallol monomethyl ether possesses the advantages of pyrogallol as a photographic developer while at the same time being free from the disadvantage of high sensitiveness to oxygen. With the present developer, perfectly clear unfaded negatives can be produced.
  • a photographic developer is prepared with 5 about 100 parts by weight of water, about 65 parts by weight of sodium sulflte and about 1.7 parts by weight of potassium pyrosulflte. To this solution about 1.7 parts by weight of pyrogallol monomethyl ether or pyrogallol monoethyl ether are added.
  • Solution B A solution is made by dissolving about parts by weight of soda crystals (sodium car- 5 bonate) to about 100 parts by weight of water.
  • pyrogallol monomethyl ether can be easily produced by partially. demethylating the dimethyl ether according to known method. It is likewise possible to convert pyrogallol into monoethyl ether 'by treating it with dimethyl sulfate. A very good yield:1 may be obtained in this latter process.
  • a photographic developer containing a pyrogallol monoalkyl ether containing a pyrogallol monoalkyl ether.
  • a photographic developer containing mon0- -methyl' ether of methyl pyrogallol 4.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
US739279A 1933-12-08 1934-08-10 Photographic developer Expired - Lifetime US2017295A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0067090 1933-12-08

Publications (1)

Publication Number Publication Date
US2017295A true US2017295A (en) 1935-10-15

Family

ID=7059637

Family Applications (1)

Application Number Title Priority Date Filing Date
US739279A Expired - Lifetime US2017295A (en) 1933-12-08 1934-08-10 Photographic developer

Country Status (2)

Country Link
US (1) US2017295A (fr)
FR (1) FR781877A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775124A (en) * 1971-06-14 1973-11-27 Fuji Photo Film Co Ltd Stabilizing method and composition for color photographic processing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3775124A (en) * 1971-06-14 1973-11-27 Fuji Photo Film Co Ltd Stabilizing method and composition for color photographic processing

Also Published As

Publication number Publication date
FR781877A (fr) 1935-05-23

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