ONE: At the top of the stack, we see the Film. It is clear with the exception of the image to be printed, which is opaque (black).
TWO: Next, a photo-sensitive material called 'photo mask' or 'photo stencil' is exposed to strong light. The light exposed areas (that are not covered by the image) of this material become hardened. The areas which are covered by the opaque image stay soft - eventually washing away. This is where the ink(s) will pass through.
THREE: This 'photo stencil' is embedded into fabric stretched very tightly across a printing frame. After the stencil dries, the 'screen frame' is pressed against the item you want screen printed (in this case a t-shirt) and ink poured onto the surface of the screen is dragged across the design with a squeegee. The ink is deposited on the item.
And that's how screen printing works!
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