DE43093C - Process for making colored photographs - Google Patents

Description

IMPERIAL

PATENT OFFICE

PATENT LETTERING

CLASS S7: Photography.

Patented in the German Empire on February 2, 1887.

The invention described below has for its purpose, through a peculiar process to produce colored photographs in such a way that the fineness in the expressions of the photograph does not suffer.

For this purpose, the inventor first takes a negative and in the usual way of this one pigment print.

An ordinary silver print on paper is then taken from the negative and over it a sheet of paper of fine, even structure was placed, coated with arrowroot or a similar starch substance is; after both are sufficiently soaked in a bath of cold water, they will brought to the retouching table in this position. As soon as the contours of the silver print become visible through the paper in front of it, the colors can be applied. the Colors are ordinary watercolors; they become thin in the appropriate places applied to the paper surface covered with arrowroot; a blurring of the Color is not necessary.

While painting it is beneficial to have the paper and the silver print on the back to get wet (the colors are applied to the front surface) to both get a good match. The silver copy, which is completely independent of the Excess pressure on the gelatin layer is produced by the inventor in order to avoid the contours and the drawing was carried out precisely during the production of the colored pictures To keep it transparent, the silver print must therefore immediately after the production of the The layer of paint is removed and no longer takes part in the further operations.

When the painting is finished, the second main part of the procedure is carried out which has the purpose of printing the pigment over the colored paper place. To do this, the inventor proceeds as follows:

First, the painted paper is placed on cold water with the colored layer facing upwards. and when the paper becomes sufficiently saturated with water and expanded enough has to sit well against the glass plate, so the glass plate and the painted one Paper brought together and pressed tightly together.

A certain degree of caution is necessary here, so that the paper that bears the color covers itself well with the fine membrane on the glass plate, which membrane has a special one Has a gelatin coating so that the paper adheres to the membrane.

The paper is then exposed to the action of steam when the paper and the Skin tightly connected to the glass; after the paper is dry, you can use it the skin stuck on it can be peeled off the glass plate.

It is then placed in a moderately strong solution of alum, washed in the same, in usually finished and hung.

One should thus obtain a colored photograph, which in all its tones and lines and has shades the perfections of the original photograph.

Claims (1)

Patent claim: Process for making colored photographs, consisting in using starch paper in the retouching frame after a moisturized, underneath one Photography (ordinary silver print) painted raw with watercolors, the painted in this way Praises paper over a gelatinized pigment image on a glass plate, it dampens, peeled off from the glass plate and finally bathed in alum solution to harden.