DE571026C - Process for the reversal development of photosensitive halogen silver layers without intermediate exposure - Google Patents
Process for the reversal development of photosensitive halogen silver layers without intermediate exposureInfo
- Publication number
- DE571026C DE571026C DEI40458D DEI0040458D DE571026C DE 571026 C DE571026 C DE 571026C DE I40458 D DEI40458 D DE I40458D DE I0040458 D DEI0040458 D DE I0040458D DE 571026 C DE571026 C DE 571026C
- Authority
- DE
- Germany
- Prior art keywords
- intermediate exposure
- silver layers
- reversal development
- development
- halogen 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
Landscapes
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
Verfahren zur Umkehrentwicklung lichtempfindlicher Halogensilberschichten ohne Zwischenbelichtung Es ist bekannt, bei der photographischen Umkehrentwicklung die Zwischenbelichtung vor der zweiten Entwicklung zu vermeiden, indem man nach dem Herauslösen des durch die erste Entwicklung hervorgerufenen Silberbildes die Bildschicht mit Lösungen von Schwefelalkalien behandelt. Diese Lösungen haben den Nachteil, daß sie stark nach Schwefelwasserstoff riechen.Process for the reverse development of photosensitive halogen silver layers without intermediate exposure It is known in photographic reversal development avoid the intermediate exposure before the second development by looking after the removal of the silver image caused by the first development Image layer treated with solutions of alkaline sulfur. These solutions have the Disadvantage that they smell strongly of hydrogen sulfide.
Wie gefunden wurde, kann die Alkalisulfidlösung zur Hervorrufung des Umkehrbildes ersetzt werden durch einen alkalischen, geringe Mengen geruchloser Schwefelverbindungen enthaltenden Entwickler. Während die bekannten alkalischen Entwickler ohne Zwischenbelichtung erst nach mindestens 20 Minuten eine Schwärzung des Halogensilbers herbeiführen, ruft der mit geringen Mengen von Schwefelverbindungen, z. B. Thiosinamin, versetzte alkalische Entwickler bereits nach einer Minute das Silberbild hervor. Für sich allein wären die Schwefelverbindungen in der geringen; Konzentration nicht imstande, das flalo,gensilher zu schwärzen.As has been found, the alkali sulfide solution can cause the Reversal image can be replaced by an alkaline, small amount of odorless Developer containing sulfur compounds. While the well-known alkaline Developers without intermediate exposure only blacken after at least 20 minutes bring about the halogen silver, calls with small amounts of sulfur compounds, z. B. thiosinamine, alkaline developers offset that after just one minute Silver picture emerges. On their own the sulfur compounds would be in the slightest; Concentration unable to blacken the flalo, gensilher.
Als geruchlose Schwefelverbindungen eignen sich außer dem bereits erwähnten Thiosinamin noch Thioharnstoff und andere Schwefelverbindungen, die geeignet sind, Schwefelsilberkeime zu bilden. Beispiel iooo ccin des an sich bekannten Metolhydrochinonentwicklers, wie er in der Praxis der Umkehrentwicklung für die erste Negativentwicklung Verwendung findet, werden mit 0,5 g Thiosinainin versetzt. Das nach der Behandlung mit dem aus Bichromat und Schwefelsäure bestehenden Umkehrbad in der Schicht zurückbleibende Halogensilber wird durch die geruchlose Lösung in weniger als einer Minute geschwärzt. Der Farbton des Silberbildes ähnelt sehr dem Ton eines mit reinen Schwefelalkalien hervorgerufenen Bildes.In addition to the already mentioned thiosinamine, thiourea and other sulfur compounds which are suitable for forming sulfur-silver nuclei are also suitable as odorless sulfur compounds. Example 10000 ccin of the metolhydroquinone developer known per se, as it is used in the practice of reverse development for the first negative development, are mixed with 0.5 g of thiosinainine. The halogen silver remaining in the layer after treatment with the reversal bath consisting of bichromate and sulfuric acid is blackened in less than a minute by the odorless solution. The color tone of the silver picture is very similar to the tone of a picture produced with pure alkaline sulfur.
Der' für das Verfahren erforderliche Entwickler kann auch in fester Form unter Zusatz des Thiosinamins oder einer entsprechenden geruchlosen Schwefelverbindung in den Handel gebracht werden.The developer required for the process can also work in solid Form with the addition of thiosinamine or a corresponding odorless sulfur compound be put on the market.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI40458D DE571026C (en) | 1931-01-18 | 1931-01-18 | Process for the reversal development of photosensitive halogen silver layers without intermediate exposure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEI40458D DE571026C (en) | 1931-01-18 | 1931-01-18 | Process for the reversal development of photosensitive halogen silver layers without intermediate exposure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE571026C true DE571026C (en) | 1933-03-01 |
Family
ID=7190314
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEI40458D Expired DE571026C (en) | 1931-01-18 | 1931-01-18 | Process for the reversal development of photosensitive halogen silver layers without intermediate exposure |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE571026C (en) |
-
1931
- 1931-01-18 DE DEI40458D patent/DE571026C/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE887733C (en) | Process for the accelerated production of a photographic positive image from an original | |
| DE1127715B (en) | Process for the simultaneous bleaching and fixing of color photographic images | |
| DE866605C (en) | Process for making photographic attenuator and bleach-fix baths | |
| DE2019995C3 (en) | Aqueous treatment solution for making silver images water-repellent | |
| DE571026C (en) | Process for the reversal development of photosensitive halogen silver layers without intermediate exposure | |
| DE2205115A1 (en) | Composition for processing a silver halide photographic light-sensitive element | |
| DE2050699A1 (en) | Solution for treating light-sensitive photographic materials | |
| DE681738C (en) | Process for the production of reversal images | |
| DE1906296C3 (en) | Silver salt diffusion process | |
| DE1597490C2 (en) | Process for the preparation of a direct positive photographic image | |
| DE690608C (en) | ||
| DE954391C (en) | Halogen silver layers containing developer substances | |
| DE2021083B2 (en) | Stabilizing bath for color photographic multilayer recording materials | |
| CH516818A (en) | Process for making photographic copies by the silver salt diffusion process | |
| DE2449325C2 (en) | ||
| DE681330C (en) | Process for the rapid development of photographic films with hot treatment baths to eliminate veil blackening | |
| DE599897C (en) | Process for the production of printing forms by means of a wash-out relief produced by photographic means | |
| DE1472896A1 (en) | Photographic quick copy process | |
| DE366131C (en) | Process for the production of two blueprints in one operation | |
| DE2102713A1 (en) | Hardening bleach-fix baths | |
| DE414485C (en) | Process for making brown toned reversal films | |
| DE437598C (en) | Inverse process for making direct positives in photographic recordings | |
| DE1597592C3 (en) | Method for bleach-fixing color photographic recording materials | |
| DE1062112B (en) | Process for achieving black or blue-black tones in the photographic direct positive process and image receiving material used for this purpose | |
| DE929459C (en) | Process for making diazotype copies |