Differentiating the front and back faces of the plates

The plate-making film is a creamy white film surface of a silver halide photosensitive layer, and the back of the film base is coated with an anti-halation layer (anti-curling layer). Generally, it is coated with a black or green film layer, and the color of the layer disappears in the developing process. The photosensitive tablets are packaged in cartridges and cartridges. The cartridge film is placed face down, and the cartridge film is curled inwards. It is normally placed (flat), and it is slightly curved toward the film surface. Recognize the positive and negative sides of the photosensitive film, you can experience the safety lights to observe the color to identify the anti-front.

The method of copying the negative picture by using the positive picture as the manuscript is a particularly rigid positive color piece, and the direct exposure method (positive vagination) is used to connect the film surface of the graphic film surface with the film surface of the photosensitive film in close contact with the vacuum exposure exposure, processing solution and process conditions. : Developed with ED-12 at room temperature, F-5 fixing, you can obtain the opposite negative film negative film.