اظهار الافلام الملفوفة Roll Films في تانك Tank .. كتاب التحميض والطبع والتكبير

Second: Showing the rolled films in the tank

These tanks are divided into the following types:

(1) A small tank that usually accommodates one film, and the film is filled into it when the chamber becomes dark (Fig. 13), and then it is sealed, then the white light is lit to carry out the display operations. This type is known as Dark Room loading tank, and where the amateurs may not have a completely dark room to perform the previous purpose, so they use a bag of black cloth that does not allow light to pass through, and is specially prepared for restoring chassis or unloading it from sensitive panels, or for unrolling rolled films He removed it from its covers, then filled it in the small tank, if it was of the previous type, which should be filled in complete darkness. This bag is known as the changing bag, and it may be on one of the pictures shown in Figure (14). Some may see a guarantee of complete darkness that the bag should be made of two layers of thick black cloth instead of one layer.
The changing bag may sometimes be replaced by a small wooden wheel with two doors (Fig. 15) in which both the tank and the film are placed first, and then the two doors are closed. The inner door has two openings in which an ambush made of thick black cloth is fixed, and at the end of each of them is a strip of elastic, and when the arms run out To the inside of the box, the rubber bands pressed on them to ensure that the light does not penetrate into the interior.

(B) Tank. It is small and often accommodates one film, and the film can be packed in it in daylight without the need for a dark room. This type is known as Day light loading Tank (Fig. 16).

The two previous types are often used by most amateurs (h) a large tank that can accommodate more than one film, and the films are suspended in it in special hangers (Fig. 17). In the safe light, and as soon as the films are placed in the demonstration tank, move --

A few times in principle to remove any possible air bubbles. It is stirred every time it is transferred to another solution.