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The screen printing process has 2 big steps. Getting the art onto the silk screen, and then using a squeegee to press an ink through the silk and onto the shirt. The screen is made by spreading a UV sensitive emulsion (goop) onto a taut piece of silk, which then dries and becomes solid. This creates a solid layer that ink will not pass through, however, at this stage adding water will cause the emulsion to return to a thick liquid form. Exposing this solid layer to UV light creates a chemical bond in the emulsion that removes much of the reactivity to water. This is used to allow ink to pass through where we want it to. By placing a completely negative image on top of the solid emulsion, light is blocked from areas covered by the image and those areas remain reactive to water. After exposing the screen with the image to UV, washing it out with pressurized water will reveal the artwork on the screen. From here the screen can be used by placing it directly on top of what you wish to print on, or for larger/more precise production, a printing press is used.