GB384770A - Improvements relating to photographic bichromate colloid processes - Google Patents

Improvements relating to photographic bichromate colloid processes

Info

Publication number
GB384770A
GB384770A GB31906/31A GB3190631A GB384770A GB 384770 A GB384770 A GB 384770A GB 31906/31 A GB31906/31 A GB 31906/31A GB 3190631 A GB3190631 A GB 3190631A GB 384770 A GB384770 A GB 384770A
Authority
GB
United Kingdom
Prior art keywords
bichromate
contrasts
print
photographic
processes
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
GB31906/31A
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.)
FERDINAND DE LESSEPS
Original Assignee
FERDINAND DE LESSEPS
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 FERDINAND DE LESSEPS filed Critical FERDINAND DE LESSEPS
Publication of GB384770A publication Critical patent/GB384770A/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
    • G03C1/00—Photosensitive materials
    • G03C1/66—Compositions containing chromates as photosensitive substances

Abstract

384,770. Bichromate processes. LESSEPS, F. DE, 65, Rue de Courcelles, Paris. Nov. 17, 1931, No. 31906. Convention date, Feb. 6. [Class 98 (ii).] To vary the contrasts in a print sodium bichromate and potassium bichromate are used in variable proportions, the former tending to produce soft, and the latter hard, contrasts. Particulars of different proportions are given. The print is developed first in cold water, then in warm water (to which ammonium or potassium carbonate may be added) to dissolve away unexposed colloid. The prints are coloured by successive immersion in solutions which react to form a coloured compound, for example first in iron perchloride and then in pyrogallic acid, tannic acid, or gallic acid.
GB31906/31A 1931-02-06 1931-11-17 Improvements relating to photographic bichromate colloid processes Expired GB384770A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR727354T 1931-02-06

Publications (1)

Publication Number Publication Date
GB384770A true GB384770A (en) 1932-12-15

Family

ID=9111215

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31906/31A Expired GB384770A (en) 1931-02-06 1931-11-17 Improvements relating to photographic bichromate colloid processes

Country Status (2)

Country Link
FR (1) FR727354A (en)
GB (1) GB384770A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577984A (en) * 1945-11-08 1951-12-11 Warnecke Harry Walter Method of making color printing plates

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2577984A (en) * 1945-11-08 1951-12-11 Warnecke Harry Walter Method of making color printing plates

Also Published As

Publication number Publication date
FR727354A (en) 1932-06-17

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