A screen is made of synthetic screen mesh stretched over a wood or metal frame. The printer coats the frame with a light-sensitive emulsion. When that's dry, the printer places the film-positive face down on the screen. A piece of glass is placed flush against the film positive. With light from an exposure lamp and a spray of warm water, an image appears on the screen. Once the screen is dry, it is clamped into a screen-printing press. The printer uses a squeegee to wipe ink through the screen mesh and onto the T-shirt.
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