DE635327C - Process for the production of white colored silver pictures - Google Patents
Process for the production of white colored silver picturesInfo
- Publication number
- DE635327C DE635327C DEI49146D DEI0049146D DE635327C DE 635327 C DE635327 C DE 635327C DE I49146 D DEI49146 D DE I49146D DE I0049146 D DEI0049146 D DE I0049146D DE 635327 C DE635327 C DE 635327C
- Authority
- DE
- Germany
- Prior art keywords
- white colored
- production
- silver
- developer
- colored silver
- 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
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
- G03C5/305—Additives other than developers
Description
Verfahren zur Herstellung weiß gefärbter Silberbilder Es ist bei reproduktionstechnischen Arbeiten üblich, entwickelte Negative bei auffallendem Licht den erforderlichen Nachbehandlungen, z. B. durch Abschwächer usw., zu unterziehen. Diese Praxis hat sich eingebürgert, da bei den hier vielfach verwendeten Kollodiumemulsionsschichten das Silber sich zu einem grauweißen Farbton entwickelt, so daß - gegen einen schwarzen Hintergrund gesehen - das Bild eines Negativs in positiver Wirkung erscheint, wodurch die Beurteilung des Fortschreitens der Abschwächung sehr erleichtert wird.Process for the production of white colored silver pictures It is with reproductive technology Working as usual, negatives developed the necessary in incident light Post-treatment, e.g. B. by attenuators, etc., to be subjected. This practice has naturalized because of the collodion emulsion layers that are often used here the silver develops a gray-white hue, so that - against a black Background seen - the image of a negative appears in a positive effect, whereby the assessment of the progression of the attenuation is very facilitated.
Es wäre praktisch von Wert, wenn bei Gelatineemulsionen das * gleiche Verfahren zur Entwicklung eines weißlichen Silbers sich durchführen ließe. Die üblichen photographischen Bromsilbergelatineschichten ergeben in den Entwicklern schwarz gefärbte Silberbilder, bei denen eine derartige positive Bildwirkung nicht zu erreichen ist.It would be useful if the same for gelatin emulsions Process for developing a whitish silver could be carried out. The usual photographic silver bromide gelatin layers give black in the developers colored silver images, in which such a positive image effect cannot be achieved is.
Es ist bekannt, durch Zusatz organischer oder anorganischer Basen zum Entwickler bei entsprechend belichteten Aufnahmen direkt zu einem Positiv zu entwickeln. Das vorliegende Verfahren jedoch arbeitet auf ein'Negativ mit in der Aufsicht positiv und weiß erscheinendem Silberbild. Es sind nun gewisse Entwickler bekannt, z. B. Paramidophenol, die ebenfalls eine weißliche Farbe des entwickelten Silbers bewirken, aber diese Entwickler sind sämtlich ausgesprochene Zeitentwickler, d. h. zur Ausentwicklung eines Bildes mit guter Deckung benötigen, sie Entwicklungszeiten von 12 Minuten und mehr. Es ist ferner bekannt, daß gewisse anorganische silberlösende Salze, z. B. Natriumchlorid, Natriumthiosulfat und Ammoniak, in hohen Konzentrationen dem Entwickler zugesetzt, ein graues Silberbild ergeben. Diese Bilder sind aber praktisch nicht verwertbar, da durch diese Verbindungen gleichzeitig Schleier und Verflachung eintreten.It is known by adding organic or inorganic bases to the developer with appropriately exposed images directly to a positive to develop. The present method, however, works on a 'negative with in the Top view positive and white appearing silver image. There are now certain developers known, e.g. B. Paramidophenol, which also developed a whitish color of the Effect silver, but these developers are all downright time developers, d. H. to develop an image with good coverage, you need development time of 12 minutes and more. It is also known that certain inorganic silver-dissolving Salts, e.g. B. sodium chloride, sodium thiosulfate and ammonia, in high concentrations added to the developer, give a gray silver image. But these pictures are practically unusable, because these connections simultaneously veil and Occur flattening.
Es wurde nun gefunden, daß durch geeignete organische Zusätze zu bekannten Rapidentwicklern ein vorzüglich brauchbares grauweißes Silberbild erhalten werden kann, und zwar in viel intensiverer Färbung, als es der beispielsweise obengenannte Paramidophenolentwickler ergibt. Derartige Zusätze sind silberlösende Abkömmlinge organischer Basen, z. B. xanthogensaure Salze verschiedener Basen, Guanidinderivate, Ammonium- oder Aminsalze der Dithioca.rbaminsäure. Die Konzentration dieser Körper im Entwickler beträgt etwa io°/o, die Entwicklung selbst verläuft normal in einer Entwicklungszeit von q. bis 5 Minuten bei 18'.It has now been found that suitable organic additives can be used Rapid developers an excellently usable gray-white silver image can be obtained can, and in much more intense coloring than the one mentioned above, for example Paramidophenol developer results. Such additives are silver-dissolving derivatives organic bases, e.g. B. xanthic acid salts of various bases, guanidine derivatives, Ammonium or amine salts of dithioca rbamic acid. The concentration of these bodies in the developer is about 10%, the development itself proceeds normally in one Development time from q. up to 5 minutes at 18 '.
Ein geeigneter Entwickler setzt sich z. B. zusammen aus iooo ccm Wasser, 3o g Sulfit sicc., 12 g Glycin, 50 g Pottasche, io g Guanidin-Rhodanid. Dieser letzte Körper kann ersetzt werden durch io bis 15 g Kaliumxanthogenat oder io bis 15 g Ammoniumdithiocarbamid.A suitable developer is z. B. together from 100 cc water, 30 g sulfite sicc., 12 g glycine, 50 g potash, 10 g guanidine rhodanide. This last body can be replaced by 10 to 15 g of potassium xanthate or 10 to 15 g of ammonium dithiocarbamide.
Claims (3)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI49146D DE635327C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white colored silver pictures |
| DEI54077D DE655852C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white-colored silver pictures |
| GB857434A GB438595A (en) | 1934-03-03 | 1934-03-19 | Improvements in the production of whitish silver images in photographic gelatin silver halide layers |
| FR785971D FR785971A (en) | 1934-03-03 | 1935-02-20 | Process for producing images of silver with white coloring |
| BE408036D BE408036A (en) | 1934-03-03 | 1935-02-21 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI49146D DE635327C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white colored silver pictures |
| DEI54077D DE655852C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white-colored silver pictures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE635327C true DE635327C (en) | 1936-09-16 |
Family
ID=27211010
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI54077D Expired DE655852C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white-colored silver pictures |
| DEI49146D Expired DE635327C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white colored silver pictures |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI54077D Expired DE655852C (en) | 1934-03-03 | 1934-03-03 | Process for the production of white-colored silver pictures |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE408036A (en) |
| DE (2) | DE655852C (en) |
| FR (1) | FR785971A (en) |
| GB (1) | GB438595A (en) |
-
1934
- 1934-03-03 DE DEI54077D patent/DE655852C/en not_active Expired
- 1934-03-03 DE DEI49146D patent/DE635327C/en not_active Expired
- 1934-03-19 GB GB857434A patent/GB438595A/en not_active Expired
-
1935
- 1935-02-20 FR FR785971D patent/FR785971A/en not_active Expired
- 1935-02-21 BE BE408036D patent/BE408036A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE408036A (en) | 1935-03-30 |
| DE655852C (en) | 1938-01-25 |
| GB438595A (en) | 1935-11-19 |
| FR785971A (en) | 1935-08-23 |
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