إظهار الصور الموجبة الملونة المطبوعة أو المكبرة على ورق حساس ملون .

Chapter Nine

Show color positives printed or enlarged on color sensitive paper

good morning

As we mentioned before regarding negative and reversal colored films, the colored display solution prepared for positive images also contains a reducing agent for color display that not only reduces silver salts to metallic silver, but the bi-products also interact with problems Color Couplers inherent in the three sensitive layers of colored paper, producing the three dyes cyan, magenta, and yellow, which form the three images. In addition to the reducing agents, the presenting solution contains activators, preservatives, and regulators for the display process. We have already explained this in detail (1) on page 187 of this book, and the stabilization process also removes the silver salts that were not reduced in the manifestation stage as well, and here we say that this process may be done in any of the following two ways: - (a) as a separate stage Using a solution consisting of ferricyanide and bromide formula e that also carries alum to increase the hardener of gelatin and regulate the degree of pH. Value (i.e. the degree of acidity or alkalinity) using a buffer such as Sod. Acetate

(1) We also recommend referring to p. 40 of the book “Development, printing and enlargement” by the author, first edition, published by The Anglo Egyptian Bookshop, 165 Muhammad Farid Street, Cairo
(b) The fixing and bleaching processes can also be done in one solution. In this latter case, another ferric salt is used instead of ferricyanide.

Ethylenediamine- tetraacetic acid

It will not be possible for the photographer who is accustomed to showing black and white sensitive paper, to show colored sensitive papers, assuming that the specific display steps for each type of sensitive paper are taken into account, and the treatment times in solutions, the correct temperatures, agitation and the appropriate safety light are observed. These are all topics previously explained on p. 176

Divisions in the tank to put the images to be shown.

Tank cover

(Fig. 74)

A kind of tanks to show colored images prepared for work in daylight.

completely. This type of tank is known as Goodman daylight developing .tank, and it consists of a basin and a cover. It is possible to divide the area of ​​​​the basin with movable partitions in order to suit the area of ​​​​the images to be shown. As for the cover, it is prepared so that it is tight on the basin, preventing the penetration of light rays, while allowing liquids to enter or exit the basin. In this way, it is similar to the exposing tanks prepared for showing films in daylight (previously we explained it on p. 22 of the book “Development, Printing and Enlargement”. The work begins by applying the colored exposing solution, then moving the tank for a period equal to the prescribed exposure period, then this display solution is thrown out of the tank. And the washing begins (and the tank is still closed), so if the washing period ends, the next solution begins to be poured, and so on.

We took this form quoting from the following reference:

jack. H. Conte-Color Prints - Revised edition. 1963 - p. 207,
And since it takes long periods of time to show colored sensitive papers, as we are used to in black and white work, so facilities have been prepared for that, some of which we show in forms (l (7574)).

We will also talk in this section about the steps of displaying some commonly used colored sensitive papers.

(Fig. 75)

Color sensitive paper display basket and paper holders:

In order to make it easier to show two sensitive papers together at the same time, a holder can be used as shown in the right part of the figure, in which two sensitive papers are placed after exposing them. The backs of the two cards are touching, and the two cards are placed through the upper slot (1). The body of the carrier and the protective wire (c) shall be made of stainless steel.

Basket (of the same type of steel mentioned above) can also be used to display a large number of sensitive papers together. This pregnancy basket is sufficient for 15 pregnant women shown in the right figure. Thus, it is possible to display 30 sensitive papers at the same time.

Kodak factories open this basket and its accessories, and it is recommended that agitation be stirred at first when placed in solutions for the first thirty seconds, then stir for five seconds every minute. , with no lift. This basket of solutions during stirring operations. Or to use a nitrogen gas stirrer that emits one batch of gas every twelve seconds. We have discussed this matter on page 178 of this book. already about