DE144554C

DE144554C -

Info

Publication number: DE144554C
Application number: DENDAT144554D
Authority: DE

Description

KAISERLICHESIMPERIAL

PATENTAMT.PATENT OFFICE.

Den Gegenstand des vorliegendes Patentes bildet ein Verfahren zur Herstellung von Pigmentbildern mittels silberhaltiger Papiere. Es ist an sich bekannt, mittels Silberemulsion farbige Bilder herzustellen, wie beispielsweise in derphotographischenKorrespondenz, 35. Jahrgang 1898, Seite 562 und 563 beschrieben ist. Das daselbst behandelte Verfahren betrifft die Herstellung von gefärbten Bildern mittels Silberemulsion, bei welchem aus einem Negativ die belichteten Stellen mittels Ammoniumpersulfat herausgelöst werden und die Platte dann mit einem Anilinfarbstoff nachgefärbt wird. Dieses Verfahren ist natürlich nur für Diapositive auf Glas oder sonstigen indifferenten Schichten zu verwenden.The subject of the present patent is a process for the production of pigment images by means of silver-containing papers. It is known per se to produce colored images by means of silver emulsion, for example is described in the photographic correspondence, 35th year 1898, pages 562 and 563. The process dealt with there relates to the production of colored images by means of silver emulsion, in which from a negative the exposed areas using ammonium persulfate are removed and the plate is then stained with an aniline dye. This The procedure is of course only for slides on glass or other indifferent layers use.

Im Nachstehenden ist nun ein Verfahren beschrieben, welches es gestattet, von der durch Lumiere entdeckten Tatsache, daßAmmoniumpersulfat aus dem Silbergelatinebild das Metall nebst der umhüllenden Gelatine herauszuholen vermag, zur Herstellung von Pigrnenlbildern mittels silberhaltiger Papiere Gebrauch zu machen. Beiläufig wird übrigens noch bemerkt, daß, wie Andresen feststellte, auch Wasserstoffsuperoxyd in saurerLösung die gleiche Eigenschaft wie das Ammoniumpersulfat hat, und daß auch andere oxydierende Flüssigkeiten, vorzugsweise solche, welche aktiven Sauerstoff zu entwickeln vermögen, für den Zweck mehr oder minder geeignet sind.In the following, a method is now described which allows the by Lumiere discovered the fact that ammonium persulfate is the metal from the silver gelatin image in addition to the enveloping gelatin, for the production of Pigrnenlbilder to make use of silver-containing papers. Incidentally, it is also noticed that, as Andresen found, hydrogen peroxide in acidic solution is the same Property like ammonium persulphate, and that other oxidizing liquids, preferably those which are able to evolve active oxygen, for the purpose more or less suitable.

Das Verfahren wird wie folgt ausgeführt:
Man mischt zu einer Halogensilbergelatineemulsion einen unlöslichen indifferenten Farbstoff im Zustande feinster Verteilung und trägt diese Emulsion auf geeignete Unterlagen, wie Papier, Glas, Zelluloid usw. auf und läßt dieselben trocknen. Sodann belichtet man unter einem Positiv, was im Gegensatz zum Chrompigmcntverfahren infolge der hohen Empfindlichkeit bei künstlichem Licht geschehen kann, entwickelt das Bild in einer der bekannten Entwicklungslösungen, fixiert es mit unterschwefligsaurem Natron, wäscht gründlich und bringt es alsdann in eine der oben angeführten Lösungen. Da das unter einem Positiv belichtete und alsdann entwickelte Bild ein Negativ war, und dieses Negativ nun durch die erwähnten Agentien mitsamt der umhüllenden Gelatine aufgelöst wird, so bleibt ein nur aus Farbstoffgelatine bestehendes Positiv zurück.The procedure is carried out as follows:
An insoluble, indifferent dye in the state of finest distribution is mixed with a silver halide gelatin emulsion and this emulsion is applied to suitable substrates such as paper, glass, celluloid, etc. and allowed to dry. Then one exposes under a positive, which, in contrast to the chromium pigment process, can be done with artificial light due to the high sensitivity, develops the image in one of the known developing solutions, fixes it with hyposulphurous soda, washes it thoroughly and then puts it in one of the solutions given above. Since the image exposed under a positive and then developed was a negative, and this negative is now dissolved by the agents mentioned together with the enveloping gelatin, a positive consisting only of dye gelatin remains.

Bei der eben beschriebenen Ausführung ist es erforderlich, von dem bei der photographischen Aufnahme resultierenden Negativ ein Diapositiv anzufertigen. Man kann aber, um dieses zu vermeiden, den folgenden Weg einschlagen, indem man das vorliegende Verfahren mit dem bekannten Umkehren der Silberbilder (vergl. z. B. Ed er's Jahrbuch der Photogr. 1891, S. 169) kombiniert. 'In the embodiment just described, it is necessary to differ from that in the photographic Record the resulting negative to make a slide. But you can get to this to avoid taking the following route by using the present procedure with the well-known reversal of the silver pictures (see e.g. Ed er's Jahrbuch der Photogr. 1891, P. 169) combined. '

Man trägt die Halogensilberpigmentschicht auf eine durchsichtige Unterlage, wie Zelluloid oder dergl. auf und exponiert dann unter einem Negativ von der Rückseite durch das Zelluloid hindurch, entwickelt wie oben, wäscht ohne zu fixieren, entfernt das reduzierte Silber, indem man es in ein Silbersalz, z. B. Chlorsilber verwandelt und das letztere mittels eines Lösungsmittels, welches Bromsilber nicht angreift, z. B. Ammoniak, auflöst. Man erhält dann an Stelle des ursprünglichen Silberbildes ein latentes Bild von reiner Pigmentgelatine, in KontaktThe silver halide pigment layer is applied to a transparent base such as celluloid or the like, and then exposed under a negative from the back through the celluloid through it, developed as above, washes without fixing, removes the reduced silver by adding it in a silver salt, e.g. B. converted into silver chlorine and the latter by means of a solvent, which does not attack bromide silver, e.g. B. ammonia, dissolves. You then get in place of the original silver image a latent image of pure pigment gelatin, in contact

Claims

with a layer that also contains bromide silver. These are now also exposed, by exposing the whole picture to light, the exposed bromide silver develops like usually and, as described in the previous method, dissolves the silver gelatin layer with ammonium persulphate or hydrogen peroxide, so that the areas not exposed during the first exposure are now the bright parts of the picture come out. In this treatment with hydrogen peroxide or persulfate remains the positive pigment gelatin image layer from which the silver is already was previously removed, stand unchanged.

Instead of applying the layer to celluloid, you can also use wax, Rubber etc. use prepared paper from which the layer can be removed, see above that after the silver has been removed from the positive, the entire layer is transferred to another base can be transferred and processed further on this. Of those in question For the present process, silver bromide has proven to be best suited to photosensitive silver salts found, and the emulsion is most advantageously so composed that it contains about 7 percent gelatin and 5 percent silver bromide. It is also for example dry madder with about double the amount of glycerine and some Arabic gum finely rubbed and of this paste about 100 g with about 130 g gelatin, dissolved in the four times the amount of water, mixed. 2000 g of the above silver bromide emulsion are then melted at about 35 °, the dye gelatihe added, both filtered together and then applied to paper in a known manner.

The development takes place in the known way:

For fixation, hyposulfil solutions are used, which are soft at the same time with acidic sodium sulfite may contain. Acidified hydrogen peroxide solution is used to dissolve the silver gelatin image used and it is recommended to use the gelatin before treatment with hydrogen peroxide to tan somewhat by soaking in a saturated alum solution for 5 minutes. The procedure described is likely to be quite a of particular importance for the production of photographs in natural colors according to the Obtain principles of three- or four-color photography by looking for suitable Produces negative or positive prints in the basic colors used and fastened one above the other in a known manner.

Patent-A ν Proverbs:

i. Process for the production of color photographs, characterized in that creates a negative or positive silver image in a halogen silver pigment glue layer through exposure and development, and then the reduced silver by means of suitable solvents together with the Silver parts enveloping glue and dye is removed, so that after the dissolution process and the fixing prior to or subsequent to this leaves a pure dye size image.

2. One embodiment of the method

according to claim 1, characterized in that in the exposed and developed Silver form before fixing the reduced silver is removed in a known manner, then the remaining halogen or. Bromide silver also exposed and after the Development on the newly exposed part the method of claim 1 for use is brought by the areas exposed to the light in the second exposure after development by suitable Solvents such as ammonium persulfate or hydrogen peroxide are removed so that the first exposed Areas from which the silver had already been removed are now a pure dye image remains behind.