الورق الحساس الملون للتكبير من سلبية ملونة ٢-a

The colored negative film is composed of a cellulosic support covered with the following layers:

1- A layer that is sensitive to blue color, which after acidification gives yellow colors. 2- A layer that contains a yellow dye that works as a filter to prevent the subsequent layers from being affected by the color.

Blue 3 (a layer sensitive to green and blue) gives a magenta color after acidification

4- A red-sensitive layer that gives cyan colors after acidification. It is noted that there is a red pigment in this layer to reduce the sensitivity of this layer to the two colors green

And blue.

Therefore, we find that the colored negative film after acidification has a strong tinge of orange due to the presence of yellow layer No. (2) and red dye in layer No. (4). This is useful when enlarging to greatly reduce the blue light emitted by the magnifier

3- Installing colored sensitive paper

Color photosensitive paper is composed of a paper backing coated with R.C. resin or a plastic material. On this pillar we find the following sensitive layers:

1- A layer that is sensitive to blue color gives a yellow color upon acidification 2- A layer sensitive to green color gives a magenta color upon acidification

3- A layer that is sensitive to the red color, and this is the layer adjacent to the paper support when acidified. Thus, we find that the colors are reflected again in the paper image, and thus we get colors close to the natural colors.

The sensitive layers in the colored sensitive film and paper, like black and white films and papers, contain silver salts. But in layers

Colored sensitizers We also find materials called color formers that turn into colored granules in the places where silver granules were formed during exposure. During the chemical treatment, we get rid of the silver granules in the bleaching stage, so only the colored image remains

It is noticed that the colored sensitive papers have a medium contrast only. As for the surface, it may be glossy, matte, or silky. The sensitive paper is very colored and requires very little exposure time. It is preferable to develop it in complete darkness or with a very dim safety light using a filter of NO.13 or 10. NO