US1899972A - Process for toning silver pictures - Google Patents
Process for toning silver pictures Download PDFInfo
- Publication number
- US1899972A US1899972A US542108A US54210831A US1899972A US 1899972 A US1899972 A US 1899972A US 542108 A US542108 A US 542108A US 54210831 A US54210831 A US 54210831A US 1899972 A US1899972 A US 1899972A
- Authority
- US
- United States
- Prior art keywords
- toning
- acid
- baths
- bath
- pictures
- 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
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
- G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
- G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
- G03C7/3046—Processing baths not provided for elsewhere, e.g. final or intermediate washings
Definitions
- HANS MENGELE or WIESBADEN, GERMANY, nssisnon v'ro 'BYK-GULDENWERKE GHEM'ISCHE FABRIK AKTIENGESELLSCHAFT, or BERLIN, GERMANY, A GORPOR-A-.
- selenium toning baths capable of toning all kinds of silver photographs including also such directly on a layer of silver bromide emulsions, i. e., without a preceding bleaching bath.
- These baths however, afiect-owing to their strong acid or alkaline reaction-the hands of the worker and also the emulsion very disadvantageously.
- the other kind of selenium toning baths does not possess this fault, but on the other hand it does not tone pictures on highly ripened halogen silver emulsions, particularly silverbromide emulsions and cannot produce the desired sepia tone without a preceding bleaching bath.
- a sepia toning bath can be obtained, which on the one hand does not influence the hands of the worker and the emulsion, and on the other hand tones pictures on silver bromide emulsions in one single working process, i. e. Without a preceding bleaching bath.
- Such a bath which is the subject matter of thisinvention contains simultaneously a solution of selenious acid and one or more easily water soluble saltsof the sulphocyanic acid. It has been found that any and all salts of sulphocyanic acid, which dissolve in water relatively easily are very useful in connection with solutions of selenious acid.
- tone bath according to the present invention is that it can be sold in powdered form, and when ready for use can be easily dissolved in a determined quantity of distilled water.
- composition is made which is highly eificient and easy to handle.
- a toning bath for photographic pictures comprising a solution containing ammonium sulphocyanide, a Weakly dissociated soluble organic acid, and selenious acid.
- a toning bath for photographicpictures comprising an aqueous solution of ammonium-suiphocyanide, citric acid, and selenious acid.
- a toning bath for photographic pictures comprising an aqueous solution of a sulphocyanide, citric acid, and se'lenious acid.
- Acomposition for use in a'toningbath for photographic pictures comprising a Water soluble'salt of sulphocyanic acid, citric acid and-seienious acid.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Patented Mar. 7, 1933 UNITED STATES.
HANS MENGELE, or WIESBADEN, GERMANY, nssisnon v'ro 'BYK-GULDENWERKE GHEM'ISCHE FABRIK AKTIENGESELLSCHAFT, or BERLIN, GERMANY, A GORPOR-A-.
TION OF GERMANY PROCESS FOR TONING sILv RrIc'rUn s No Drawing. Application filed June 4, 1931, Serial l i'o. 542,108, and in Germany June 5, 1930."
ing baths have been used, which either contained gold or selenium as a tone giving substance. The material distinction of gold toning baths lies in the fact the former are much -more expensive than the latter and contain the tone giving ingredient as cation or as complexions. Principally on account of the lower cost the selenium toning baths have a steadily increasing demand. If, however, in spite of this gold toning baths are still in use, this is due tothe fact that selenium toning baths possess several disadvantages.
Mainly two groups of selenium toning baths must be distinguished, namely selenium toning baths, capable of toning all kinds of silver photographs including also such directly on a layer of silver bromide emulsions, i. e., without a preceding bleaching bath. These baths, however, afiect-owing to their strong acid or alkaline reaction-the hands of the worker and also the emulsion very disadvantageously. The other kind of selenium toning baths, however, does not possess this fault, but on the other hand it does not tone pictures on highly ripened halogen silver emulsions, particularly silverbromide emulsions and cannot produce the desired sepia tone without a preceding bleaching bath.
It has now been found that a sepia toning bath can be obtained, which on the one hand does not influence the hands of the worker and the emulsion, and on the other hand tones pictures on silver bromide emulsions in one single working process, i. e. Without a preceding bleaching bath. Such a bath which is the subject matter of thisinvention contains simultaneously a solution of selenious acid and one or more easily water soluble saltsof the sulphocyanic acid. It has been found that any and all salts of sulphocyanic acid, which dissolve in water relatively easily are very useful in connection with solutions of selenious acid.
A photograph inserted in such a solution shows within a few minutes a perfect sepia tone. Contrary to most of the toning baths,
a selenium toning both according to the pres GIItLlDVQDtlOH produces always the same-tone of picture on the same kind of emulsion;
.whereas toning baths heretofore known give exceedingly varying results in colour.
The addition of an organic acid to the solution greatly enhances the life of the toning bath, therefore increasing its efiiciency and also the number of pictures which can be handled by one and the same solution and bath without adversely influencing its other properties and qualifications. This feature is the more surprising, since the addition of organic acids to gold toning baths and the addition ofsalts of organic acids to other selenium toning baths has no stabilizing eflfect.
Another advantage of the tone bath according to the present invention is that it can be sold in powdered form, and when ready for use can be easily dissolved in a determined quantity of distilled water.
he following example 1 features of my invention:
s indicative of the Grams Ammonlum sulphocyanlde Citric acid 1 Selenious acid 0,5
are dissolved in 100 com. of distilled Water;
with this solution the photographs are then treated.
From the foregoing description of the preferred embodiment of the invention it will be noted that a composition is made which is highly eificient and easy to handle.
While one preferred embodiment of the invention has been disclosed it is evident that and a Weakly dissociated organic acid for increasing the efiiciency of said acid and salt.
3. A toning bath for photographic pictures comprising a solution containing ammonium sulphocyanide, a Weakly dissociated soluble organic acid, and selenious acid.
4. A toning bath for photographicpictures comprising an aqueous solution of ammonium-suiphocyanide, citric acid, and selenious acid.
5. A toning bath for photographic pictures comprising an aqueous solution of a sulphocyanide, citric acid, and se'lenious acid.
6. Acomposition for use in a'toningbath for photographic pictures comprising a Water soluble'salt of sulphocyanic acid, citric acid and-seienious acid.
Intestimony whereof I affix my'signature.
HANS lVEENGELE.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEM0017930 | 1930-06-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1899972A true US1899972A (en) | 1933-03-07 |
Family
ID=7297587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US542108A Expired - Lifetime US1899972A (en) | 1930-06-05 | 1931-06-04 | Process for toning silver pictures |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1899972A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659674A (en) * | 1948-04-05 | 1953-11-17 | Hyndman Olan Robert | Method of toning photographs and composition therefor |
-
1931
- 1931-06-04 US US542108A patent/US1899972A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2659674A (en) * | 1948-04-05 | 1953-11-17 | Hyndman Olan Robert | Method of toning photographs and composition therefor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE900298C (en) | Contact process for the production of photographic positive images using highly sensitive negative layers | |
| DE736692C (en) | Process for increasing the sensitivity of photographic silver halide emulsions | |
| DE1177000B (en) | Photographic material with layers containing wetting agents | |
| US1899972A (en) | Process for toning silver pictures | |
| US2669515A (en) | Direct positive emulsions | |
| US3684512A (en) | Photographic monobaths | |
| DE972720C (en) | Sensitized photographic material | |
| DE1051117B (en) | Process for simultaneously bleaching and fixing a color photographic image | |
| DE1422892A1 (en) | Development process | |
| US2346775A (en) | Fixing agent and process for fixing colloid reliefs | |
| US2397016A (en) | Combined developer and fixer | |
| US2836493A (en) | Photographic shortstop concentrates | |
| DE954391C (en) | Halogen silver layers containing developer substances | |
| US568496A (en) | Self-toning sensitive photographic paper | |
| DE1023969B (en) | Process and material for the production of direct positive images by the halogen silver diffusion process | |
| US2494765A (en) | Chemical erasing of photographic silver images | |
| DE2021083C3 (en) | Stabilizing bath for multilayer color photographic recording materials | |
| US642941A (en) | Sensitized photographic paper. | |
| US2053516A (en) | Fine-grain developers | |
| DE525256C (en) | Process for toning silver photographic images | |
| DE1472893A1 (en) | Halogen silver photographic material with anti-fog protection | |
| AT238032B (en) | Image receiving material for the silver complex diffusion transfer process | |
| US2152460A (en) | Manufacture of photographic gelatin emulsions | |
| US1849245A (en) | Toning bath for photocraphic prints | |
| US1499749A (en) | Composition for toning photographic silver images |