معمل التصوير الضوئي .. كتاب التحميض والطبع والتكبير

Chapter fifteen

Photographic lab

All photographic processes such as developing, printing, enlarging and repairing image defects are carried out in light-tight rooms that have been called “dark room” or “photo-lab”. It is necessary - in order to facilitate work and increase production efficiency - to prepare These laboratories are according to special specifications, whether when they are designed in the construction phase or how they are equipped with equipment, and for this reason we have decided to dedicate this section to research the following topics.

_ Floor, wall and ceiling of the photography lab.

_ Means of preventing light penetration through the main entrance and windows.

Ventilation means.

_ Control the temperature of the display solutions and the washing water.

The internal arrangement of the photography lab.

(a) Amateur coefficient.
(b) Photographic laboratories suitable for professionals, scientific research work, or educational purposes.

_ Raising the productivity efficiency in the photography lab by arranging and distributing work.

_ Means for cleaning display basins and utensils and removing stains resulting from solutions from walls, floors, hands or clothes.

_ We have previously talked about the appropriate safety light for each of the different photographing operations (pg. 42 and figures 22, 23).

Floor, wall and ceiling of the photo lab:

Basically, it is stipulated that the area of ​​the photocopying laboratory should not exceed the appropriate amount for the amount of production that takes place in it, and the appropriate amount for the number of people working in the laboratory at one time, and the number and size of the devices that are located in it. It is necessary that the floor and walls of the imaging laboratory be prepared in a way that allows it to be cleaned easily from traces of solutions saturated with chemicals, and allows it to be isolated from moisture and liquids. Therefore, it may be better - if we are thinking of establishing a new factory - to work on isolating the floor with a layer of asphalt (its thickness is almost a name). If the building is old, it is better to cover the floor with other suitable materials, such as pieces of rubber that are not affected by acids, sticking next to each other, or covering the floor with linoleum. This process becomes necessary if the floor is made of wood. If it was left like this, it would certainly be destroyed from the effects of the solutions, especially from the remnants of hypo (sodium thiosulfate), which turns into sulfuric acid over time, destroying all the wood. As for the wall, it must be covered with faience in the places adjacent to the water basins. It is not advisable to replace faience with mosaico due to the former's vulnerability and acid erosion. Although there is an old traditional idea that calls for painting the plant in a black color, it is a wrong idea. Rather, it is more appropriate to paint it with oil in a light white or yellow color, just as the ceiling is painted in a light color as well. It is a mistake to coat the walls of the factory with lime or glue, as it is likely that moisture will affect it, and parts of the whiteness will fall on the films, pictures, or in the display tanks.