DE615629C - Process for the production of photographic images, optionally by the reflectographic process - Google Patents

Description

Process for the production of photographic images, if appropriate Investigations by M a t e M u d r o v c according to the reflectographic method i c have led to the result that cyanines, i.e. known photographic sensitizers, to a very large extent by other basic dyes, e.g. B. methylene blue, flavindulin, be sensitized.

It has now been found that the awareness is so considerable is that it could be made into a photographic process. In addition Purposes one impregnates one of the film-like structures, which are otherwise used as a carrier of the photosensitive Serve layer with cyanines sensitized in this way. Then exposed one under a template up to the bleaching of the ground and can now, like the Has identified the inventor; fix the positive image, d. H. make lightfast by it is now treated with a reducing substance that penetrates and in the image-carrying layer remains permanently.

Example A mixture of the cyanine dye and the sensitizer is prepared ago, for example an alcoholic aqueous solution of pinachrome and methylene blue, in which the former has the concentration i: 500o and less, the latter i: 500o and less. A suitable pure paper is coated with it, so that a strong purple Color occurs. One dries and exposes a few in the sun or with UV light Minutes to get a positive image of the original.

Now the paper is made with an i 0% alcoholic ethereal Thiasinamine solution moistened with a spray. As a result, the lightfastness of the Picture @eiri; it dries instantly.

The process hereafter is almost as convenient as the dry ozalide process. Of course, you can also use translucent and: transparent films.

If you use gelulose esters or ethers, condensation products, instead of paper from urea and formaldehyde or other such film-like structures, so recommended - it is, only the top layer or: a very thin applied layer to provide them with the cyanines by putting them and their sensitizers together dissolves with the mentioned products -and then pours on or applies, for example as with Coating an acetyl film with nitro lacquer. Instead, you can watch the films bathe in the solution of the cyanines, etc., whereby one also expediently such solutions used, which on the one hand dissolve the cyanines and the sensitizers, on the other hand dissolve or swell the film material on the surface, the latter can of course also be done through an independent process. The same recommends regarding the fixation of the image by thiosinamine, etc.

The process is also suitable for the production of images after refliectographic process, whereby it does not matter so much, the obtained To fix images because the reflectograms are kept in the dark. '

Claims (1)

PATENT CLAIM: Process for the production of photographic images, optionally according to the reflectographic process, characterized in that that films or layers sensitized with methylene blue or flavindulin Cyanines are impregnated, exposed under an original until the background has faded and then fixed with thiosinamine.