Photographic film, also known as dry film, is used to make PCB board, on top of the PCB, it become a sensitive circuit board. Suitable for plating, hole covering,and the process. Excellent adhesion to almost all surfaces Image clarity after exposure Front-panel is very clean after developed :The dry film is to most of the acid solution, the PH value can be to most alkaline solution between PH8.0 ~8.5. Cover hole:1.5 dry film can fully cover a 0.25 inches thickness hole. Plating:The dry film is available in most common use of the plating bath, no wrinkles, no color. Material: Resin colour: Blue size: 30cm x 5M Package include 4 x photosensitive dry film/in Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.