DE1422864A1 - Process for developing and fixing an exposed photographic material as well as developer mixtures and developer solutions for carrying out the same - Google Patents

Description

Eastman Kodak Companys 343 State Street »Rochester, State of Hew Toric, VereiiiigiaStates before>

and fixing a photographic material and developer solutions and

The invention relates to a process for developing and fixing an exposed photographic material, in particular for dividing photographic recordings after the copying process. Bis invention also relates to photographic developer and developer solutions, in particular for developing and pixellating τοη exposed photographic material with a photosensitive silver halide emulsion which has been exposed until a visible silver image is formed.

Photographisehen to the material of the latter include some Klaese recording papers, which with a high Iiamp "intensity in an electrical receptacle device

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being exposed «These materials provide a visible Recording as a so-called "copied out" silver image without

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each before mix treatment · / This silver images can be, but considered only when ^ einejs ^ iiiBdrigen MchtniTesu and must be kept in the dark to su Yerhindem that the silver halide: Background "auskopiert ¹ ×, Ms it has sufficient density to the Mask original image.

It is possible to test such exposed materials after known for exposed silver halide emulsions " Develop and fix EU, but becomes expediency and the simplicity of the system is greatly reduced by that two stages of chemical processing are carried out Need to become. In practice it has been shown that the Development stage requires very careful control: that is necessary because the silver halide of the background, which normally has a sufficiently low exposure! Yeau to avoid a latent ® to form a developable image with great ease can design and mask the desired image.

An exposed silver halide, which has a recorded "copied ^H image of the type described," can be treated with a complexing agent

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stabilized under conditions which result in very little loss of silver from the emulsion. As a result, it can be treated with a developer which turns silver on the "copied out" image by reducing the complex-bound, already vöihanäeneft ^ blifes ^ s-'ai ^ over. Under these process conditions, it is possible to achieve a strong distinction between the recorded ^H copied ^M image and its background, which can also be partially "copied out" a stabilizing bath and development in a suitable developer «

The method of the invention overcomes these disadvantages. It is characterized in that the exposed material is treated with a mixture that contains an alkaline compound, at least one developer compound and contains such an amount of a silver halide complex-binding compound that the silver halide of the exposed Emulsion areas are converted into a complex before a visible effect of the mixture Image is created.

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Are 8 $ 1φβ 3 ^ twi <j connections preferably used in the IBT drive of the invention _? the non-staining have a non-staining effect, so that fixing and washing are unnecessary. 3 ~ py3? ÄaöliäoB and. Acorbic acid, which is described in British patent application Hr767 700. ,

To carry out the process of the invention, a developing agent or a developer solution "which is keaneeiehjatet by an alkaline compound" is used, as well as a content of a silver halide complex-binding compound, which is sufficient that this is transferred silver halide of the exposed ül iäaulsionsbezirke in a complex bev |> rdurch exposure to the mixture or solution iS a visible "®, image is produced.

Enter the term complex-binding compounds for example compounds such as Alkalimet all thiocyanate, Thiosulphates, etc., which are a light-infused silver * compound by reaction with undeveloped silver halide form and which show little or no effect on developed silver. About the resulting silver complex

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should be light-colored or transparent so that he doesn’t bother you when you see the finished picture. These compounds are generally made under different conditions used than they would in normal fusing procedures as most of the complexed silver - remains in the developed emulsion layer

The silver halide complex binding agent or the silver halide complex binding agent Compound must be sufficiently active to turn the silver halide in the emulsion into one Complex to convict before a visible image in the Emulsion is caused by the development mixture and the compound binding the silver halide must ensure that this image is formed solely by physical development, the image silver is provided or supplied by the complex-bound silver halide »With short development or processing times the complex-binding agent or the complexbiniäande connection should be as active as possible » because then the activity of the developmental association corresponds accordingly can be increased without chemical evolution taking place. It has been shown that sodium and potassium thiocyanates, particularly suitable silver halide complex binders Compounds for the process of the present invention are because they are both in alkaline -

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Entwicklungsliaigslösimgeii are very active and stable · The Concentration should be greater than 70 g per liter and preferably between 100 and 250 g per mat. 33 concentration range from 120 to t5Ö g pro uter is particularly beneficial.

The following examples are intended to illustrate the method of the invention illustrate in more detail.

example 1

"Kodak" R, P. 12 recording paper was in a Hartmann and Brown mercury vapor recording device exposed ", both with and without Naehexponierung against a AuSenbelicntung, then the exposed paper was immersed in the process solution whose composition is given below" The iauchzeit b.etrug 30 admission at 20 ⁰ C, The paper treated in this way was squeezed off and dried. In each case, a stable image was obtained with a very low background density.

Procedural solution n ^

1-Phenyl-5 ~ pyrazolidone 1g

Sodium sulfite (anhydrous) 50 g

Ascorbic acid 10 g

sodium carbonate (anhydrous) 20 g

Potassium thioeyanate 150 g

filled up with water to 1 night.

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JPamples of the exposed recording paper, which ait the described above. Process solution different times long, between 30 seconds and an hour, showed "only a very small deviation in quality. In the lall that the exposed absorbent paper not sufficiently exposed, including completing the masking of the captured image, was it sufficiently developed and stabilized by the »procedural solution described above.

The temperature at which the paper can be treated in the solution described above is not critical and good quality prints were made at 30 ° C. At temperatures higher than 30 ° C, a softening of the emulsion may occur, rather than at temperatures below 20 ⁰ G. It has been found that it is möglieh to venaindern the softening effect of the Terfahrenslösung characterized in that the solution is about 25 g GlutaraldehyÄ be added.

Example 2

"Kodak" EP12 recording paper was in. The same as described in Example 1, exposed and then 50 seconds at 2O ⁰ G in a VerfährenelÖsung $) änach ^k the paper "named, • is .beschrieben whose composition down?" Squeezed and dried. It became, a

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stable picture with a very low
inherited

"■■ '" ■■ ·' - * ■ "· ■ - '■'" ■ * ■ * ■ "■ .; Yerf ahren's solution

Monomeinyl paraaminopiliol sulfate 2.2 g

»Atritua oil sulfite (anhydrous) ^:! ; - ■ ^r ^ - 72 ^ 0 g

Hydroquinone. 8.8 g

KatriüÄcarbönat (anhydrous} ¹ ^ ^ ^; ^ v ■ ---. ^ 48VO g

Potassium niocyanate 150. Og

Waemer aiifgeitillt on 1 mter>

• BADOBiQSNAL
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Claims (1)

Claims 1. A method for developing and fixing an exposed photographic material, characterized in that the material is treated with a mixture containing an alkaline compound, at least one ₅ Entwicklerrerbindung und.eine such amount of a silver halide complex-binding compound contains "that the silver halide of the exposed emulsion districts is converted into a complex before a visible image is created by the action of the mixture. 2 * Method according to claim 1, characterized in that that the copied image is treated with an aqueous solution of the mixture. 3 · A process according to claims 1 and 2, characterized in 'that the auskopierte image is treated for 30 seconds to 1 hour at temperatures of 20 to 30 ⁰ C. BATH 809805/081 1 - το - 4. Photographer! see developer disapproval or solution for implementation of the method according to claims 1 to 3, characterized by a content of an alkaline compound, at least one developer compound and one such an amount of a silver halide complex Compound sufficient to make the silver halide of the exposed emulsion areas is converted into a complex before a visible image is created by the action of the mixture or solution. 5. Photographic developer mixture or solution according to claim 4t characterized in that the silver halide complex binding Compound consists of an alkali metal thioeyanate » 6. Photographic developer solution according to claim 5 »characterized in that it contains at least JO g per liter of thiocyanate .. 7. A photographic developer solution according to claim 5, characterized characterized in that it contains 100 to 250 g per liter of thiocyanate. , 8. Photographic developer mixture or solution according to claim 4, characterized in that the or at least one developer compound consists of hydroquinone 8 0 980 5/08 11 9 * Photographer's developer mixture or solution according to one of Claims 4 to 7, characterized in that it
contains 1-phenyl-5-pyrazolidone and ascorbic acid as developer compound. 10. A photographic developer solution according to any one of the claims 4 to 9 * characterized in that they are per liter of solution 1 g i-phenyl - ^ - pyrazolidoÄ, 50 g anhydrous sodium sulfite, 10 g ascorbic acid ^ 20 g anhydrous sodium carbonate and contains 150 grams of aluminum thiocyanate. 80S8 Q5 / 08 1: I ^ ^ -0 \