DE635990C - Process for the production of multicolor images on aluminum or its alloys - Google Patents

Description

Process for the production of multicolor images on aluminum or Its alloys. It is known to produce multicolor images by red, yellow and blue partial images simultaneously or one after the other on the same surface copied. The monochrome images in red, yellow and blue are known to be thereby prepared by photographing the object through green, blue and yellow filters and the copies with the corresponding complementary colors red, yellow and Stains blue. For images that contain the named colors next to each other, always succeeded; To produce multicolor images by Allowing the filters to be used with appropriate coverage of the differently colored parts of the object Create, transfer and color negatives.

By: electrolytic oxidation of aluminum or its alloys on the other hand succeeded in producing absorbent layers, which in turn were made with light-sensitive All kinds of substances, such as B. silver halide solutions, iron salts and others., Impregnated could become. Aluminum sheets prepared in this way were then exposed, developed, fixed and could optionally be toned in any way, usually with gold will. The pictures produced in this way had the usual light-dark contrast stone normal photography based on the dark color by toning between light brown and jet black could be modified. Of course, a change in color was also successful by the well-known copying that replaces the short-term exposure and subsequent Development could occur.

It has also already been proposed for the aforementioned metallic image carriers been used to generate images that - the coloring of a certain spectral range exhibited. So it was possible to produce single-color pictures that were neither black nor were gray nor brown. One had z. B. encouraged to create blue images by that the oxidic layer with iron salts, z. B. red blood liquor salt and ammonium ferric acid, prepared, after which pictures of Berlin blue were created by exposure. Farther it was known that by heating such a blue picture the transformation of the iron salt into the iron trioxide could be made, whereby a yellow image was formed. On the other hand had already become known, a gold-toned silver picture on aluminum through Transfer heating to a red image. The red color is due to the " - to trace back the changed degree of dispersion of the gold caused by heating, that in this form with the aluminum oxide may be connected to the type of legs Cassius' gold purple enters.

According to the present invention, an appropriate combination succeeds the well-known color generation of photo images on aluminum or its legends, the surprising generation of true-to-nature multicolor images. il =: ' The negative obtained is copied onto: an electrolytically oxidized aluminum surface impregnated with silver salt. After developing and fixing, it is toned with gold and the resulting partial image is colored red by heating the plate.

The resulting red image is again with a light-sensitive Sensitized substance, iron ammonium citrate is now used. On the The image carrier prepared in this way is copied from the negative produced behind the blue filter and thus receives the blue color of the iron-blue image in the areas to be colored yellow. It is re-developed and fixed by extraction with water. The following one second heating transforms the blue color into the yellow of the iron oxide, with which through the interplay of the red and yellow image, a two-faced image, is achieved.

The two-color image obtained in the way described above becomes now subject to a third sensitization, this time as well as in the second Trap is carried out with iron salts. With the help of the third negative, which was created behind a yellow filter, you then put the on the same plate to complement the necessary blue image by copying, developing and again fixed by washing out with water.

In this way it is possible to create pictures in true-to-life colors, if, as is known from the photographic art, the negative marks to ensure perfect coverage of the individual copies.

2. The under i. The procedure outlined is modified to the effect that that the G: elb image is generated in front of the red image. The experiments have shown that that the sequence of the first two processes for the desired success without Meaning is.

= Ä. If this is the case with multi-colored scales, tables, curves, etc., that individual parts of the object, which do not overlap, 'in different If colors are to be reproduced, these adjacent colors can be used caused by the fact that the filters colored differently are omitted Object parts covered during production of the negative and the resulting partial images on the aluminum, after which in detail for the colors mentioned the above staining methods described in detail are used.

In some cases it is useful to add a black print. In practice, the three-color image is then sensitized once more, in the case of the desired one Black print with silver salt, after which a copy of one without a filter was made without toning Negative is produced.

Claims (2)

PATENTED FRUIT: -i. Method for producing multicolor images on aluminum or its alloys, which are electrolytically produced according to known processes are oxidized and impregnated with photosensitive substances by manufacturing several photographic partial images, characterized in that as a red partial image a heated, gold-toned silver picture, as a yellow partial picture a heated iron-blue picture and an unheated one as a blue partial image. Iron blue picture is used. 2. Procedure according to claim i, characterized in that a black print is added to the three-color image is added to the three-color image with the help of a negative produced without a filter on-. is copied.