What is the principle of "dry film" in printing industry? Who knows?

The principle of "dry film" is the process of transferring negative or positive information to printing plates or other photosensitive materials through contact exposure. When the manuscript (transparent film) is in close contact with the surface of the printing plate coated with photosensitive adhesive, the photosensitive adhesive changes chemically through photochemical action, thus obtaining a printing plate that meets the requirements of lithography quality.

Movies are all black. Generally, there is an English symbol on the corner of the film, which is the film number, indicating which film C, M, Y and K are, and which cmyk (or spot color number) is, indicating what color this film outputs. If not, you can look at the angle of the net to tell what color it is.

Extended data:

Different types of movies actually react differently to colors, especially color movies. If the film is more sensitive to a certain color, shooting with it will "exaggerate" the color, because the light of that color will act on more photosensitive crystals.

In terms of optical rotation, color films will have greater flexibility. Different brands and different series of color films will react differently to different colors, some colors will be stronger, and one pair of individual colors will perform better, and so on. In addition, some color films react strongly to color, and the photos taken will be more "gorgeous", on the contrary, there will be colors that are more loyal to the original.

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