اظهار الأفلام الرفرسال المتعددة الطبقات١_a .. كتاب التصوير الملون ، عبد الفتاح رياض

Showcasing multi-layered films

As we learned before, this type of film is divided into two factions: (1) Films that do not carry color problems, Color Couplers, in its three sensitive layers, which calls for adding color problems to the appearance solution. (b) Films bearing (color problems) within their three sensitive layers. We discuss the following on how to display each type:

Show colored reversal films that carry «color problems» within their sensitive layers:

It is not difficult - even for amateurs to carry out the operations of showing the reversal films that fall under this family, if the general rules regarding temperatures and the accuracy of the installation of solutions are taken into account.

In the following, we will start by summarizing the main stages that this process goes through, provided that we return in the next section to explain the steps in detail for some types of reversal films that fall under this family.

(1) Treating the film in the first negative buffer solution, which is nothing more than a buffer solution that carries methol and hydroquinone as reducing agents or amidol alone. Thus, negative images of silver are formed at this stage. (2) The film is washed or treated in a gelatin-hardened stop solution

stop & hardening solution. (3) Exposing the film to light to affect it, it was not reduced from the grains of silver salts in the stage of the first negative manifestation, (and these grains are the ones on which the film is relied upon.

Configure the following positive images.

(1) It advises the reader to refer first to the book “Al-Takhmidh wa’l-Taba’ wa-Takbeer” by the author in Chapter Twelve, pages 356 to 382 in the first edition, in order to become acquainted with the theory of reversal display and its usual steps in black and white film.
. (4) The film is treated in a color developer solution, so the grains of silver salts are reduced to metallic silver - which will later be a positive image, then the products of the silver salts reduction process interact with “color problems, which are present in the three sensitive layers, forming images in it.” Three dyes, one of which is yellow, the second is scarlet, and the third is cyan (e). The previous stage may be followed by subsequent steps to wash the film or treat it to stop or strengthen the hardness of the gelatin.

(6) After that, it is necessary to work on dissolving the silver image from the three layers using a bleaching bath solution, so that nothing remains in it except the images of the three dyes.

(7) As it is possible that some residues of silver halides remain in the sensitive layers, which were not reduced in the (second) color rendering stage, therefore the film is treated in a hypo-fixation solution, followed by a good wash.

And in the colored paintings in Figures 60, p. -

Show colored reversal films that do not carry “color problems” within their sensitive layers, but rather are added to color display solutions.

This type of film is shown by the factories that produce it or by the sub-laboratories attached to it, as its display requires equipment and extreme accuracy that may not be available to many, and it also requires careful supervision and continuous analysis of the solutions used in the various steps.

We summarize the following main steps that are followed in the display: (1) A first negative display to convert the latent image into a negative image, and at this stage a display solution similar to the solutions used to display black and white reflective films is used...

And after a hand begins (2) exposing the film to red rays in order for it to be affected unless it is reduced from the remaining silver salts in the sensitive layer to red rays (adjacent to the support), the stage of the first color exposure in a solution that bears the problems of the color cyan couplers. Here, two positive images are formed, one of which is a dye image (of this color) in addition to another image of silver. (3) Exposing the film to blue rays, in order for it to be affected by what was not reduced from the remaining silver salts in the upper layer sensitive to blue rays, and then the process of the second colored exposure begins in a mixture bearing yellow color problems. Here, two positive images are formed, one of which is a dye image (of this yellow color) in addition to another positive image of silver.

(4) Exposing the film to green rays (1) in order for it to be affected by what has not been reduced from the remaining silver salts in the middle layer that is sensitive to green rays, and after that the third color rendering process begins in a solution of appearance that bears the problems of the color magenta couplers, and thus two positive images are formed, one of which is dye images dye Image ) of this scarlet color) in addition to another image of it with silver positive from

(E) By the end of the third color exposure, the film will have carried three images of different dyes: cyan, yellow, and magenta.

(1)

Focal Eneyclopedia of Photography P. 213 It was stated in the previous reference that the film is exposed at this stage to green rays, as it was stated in the reference that we will mention later, that the film may be exposed at this stage to white rays. We comment on that that the light used in the third exposure will be green or white, as in the previous two exposures, each of the two layers sensitive to red and blue rays was affected. This last reference is:

C. Leslie Thomson. Color Transparencies, 1st, edit., p. 199

(fig. 54)

Steps to show Kodachrome movies

In order to facilitate the display of large numbers of these films in large laboratories, it is recommended that the short films be connected to each other, and wrapped around a reel (shown in the upper right side of the figure). These films pass through the following stages:

(1) In the first negative exposure solution, the silver salts are reduced to metallic silver as much as they have been exposed to light.

(2) In the stop solution, to stop the reduction immediately.

(3) In the wash bath to remove traces of the suspension solution.

(4) Then it was exposed to red rays, in order to affect the lower sensitive layer adjacent to the support, and the silver salts remaining in it (which were not reduced in the first negative manifestation stage, and on which the formation of the positive image depends) become reducible when treated in the solution of the special appearance.

it (next).

(0) Then display in the color highlighting solution which contains Cyan Color couplers

(1) Then washing to remove traces of the previous appearance solution.

(7) Then it was exposed to blue rays in order to affect the upper layer that is sensitive to blue rays (8) and then treated in a colored highlighting solution that contains yellow color problems.

(9) Then washing to remove traces of the previous appearance solution.

(10) Then exposure to green rays, or white rays, in order to affect the middle class

sensitive to green rays.

(11) Then in the third color highlighting solution that carries scarlet color problems.

(12) Then washing to remove traces of the previous appearance solution (13) Then treatment in a silver bleach bath that works to transform the skin.

silver into silver salts.

(14) and then in a fixing solution that removes the silver salts produced in the last step

(15) Then the final wash.
respectively, as each layer has silver positive images. Therefore, it is necessary to work on melting the images of the silver so that nothing remains on the film except the images of the three dyes. The silver is dissolved in a special bleaching bath solution

What we mentioned above is nothing more than a summary of the main steps only, as there are other steps between the previous stages that we did not mention, such as washing operations, stopping or increasing hardness, and it may replace exposure operations by using special solutions that will create a shelf called Fogging. developers Haze, which is who knows

Since the factories producing this type of film did not publish any detailed data on showing it, so we are satisfied here with this certain amount of it.

(fig. 55)

Formation of colored images according to the method of addition:

(1) Filming the original subject begins through three filters, one of which is red, the second green, and the third blue, on three separate “black and white” films. The images resulting from this stage are what we call Color separation negatives.

(2) By printing the color separated negatives on raw films (black and white » Also, you get three Color separation positives

(3) Each of the three color-separated positive images is placed in a special projector for each and every image, so that the rays emitted from the first are red, from the second is green, and from the third is blue. The colored rays emitted by the three sources on top of each other produce the final colored image.