![]() For our example, we going to use a “home-made” exposure unit-one that uses fluorescent bulbs as the light source. Now that we've gotten that out of the way, let's discuss the screen burning process in earnest. When the screen has dried and is ready for printing, ink is placed in the screen and driven through the stencil with a "squeegee" thus creating a printed image. The stencil is the "open area" of the screen. ![]() Water is then applied to the screen during the "washout" process and only the portion of the screen that contains the image "washes out," thus creating the stencil. The exposure process can take from just a few seconds to several minutes, depending on the type of exposure unit. When the light hits the screen, only the area darkened by the film positive "develops." The screen is coated with a photographic chemical solution that is sensitive to light known as photo emulsion. The film positive is placed on the exposure unit glass (an exposure unit is the light-emitting device used to create a screen exposure) during the exposure process also known as "burning a screen." The “film positive” of the artwork (either inkjet film or vellum paper) is ideally completely opaque (pure black) and the rest of the film positive, of course, remains clear or translucent. Before we get started on the different methods to burning a screen, here's a recap summary of the screen making process: Artwork is printed onto a film positive.
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