صبغ الصور الموجبة Toning .. كتاب التحميض والطبع والتكبير

Chapter fourteen

Toning positive images

First - Warm Brown Toning

It is required for the images to be dyed that the white parts in them be very white, and that the black parts in them be very black as well, and these characteristics are available in the images that obtained a correct exposure during photography and accurately floated during the display and enlargement operations.

Before work, we must verify that the image has been fixed and the final wash well. The process of dyeing the images takes place in two stages:

(a) Bleaching
(b) Toning dye

Another solution to dye the image brown:

This solution is suitable for brown dyeing, especially for chlorobromide-sensitive leaves. It is better to increase the density of images treated in this solution than the usual limit.

Second - dyeing the image in blue or greenish blue:

This blue color is known as “Prussian blue” and can be replaced by a blue that tends to greenish blue by re-staining the blue image in a sodium sulfide solution. Here we show the steps of the two stages:

(1) Dyeing blue:

Before dyeing the image, it must be verified that it is completely fixed and washed well. In this case, the image is colored directly in one process only by dipping it in the following solution for half a minute at a temperature of 20 °C.
And after the picture is colored in the desired way, it is washed with water until the white areas appear very white.

(b) dyeing greenish blue:
The blue image can be converted to a blue-green if it floats in the next diluted solution.

Third - dye the image in bright red:

This process takes place in two stages, as shown below:

(a) Dye the image brown in Gevaert 411 solution p. 443) and then wash it well with water.

(b) The image in the solution whose composition is shown is treated as follows:

Prepare the working solution:

Ten parts of the first solution are added to one part of the second solution.

Action Steps :

The image is placed in the mixture of the two solutions for ten minutes, and as soon as the color reaches the degree we want, the image is washed quickly, then transferred to a fixation bath of hypo concentration (10%) and left in it for a period ranging between 5 to 10 minutes, after which the image is washed with water well.

It is obligatory to move the images throughout the dyeing process so that they do not stick to one another, and one liter is sufficient to dye approximately twenty-five images, each measuring 10 x 15 cm, or the equivalent of this area in terms of other measures.