Measure the inside dimension of a screen printing frame. Cut a piece of foam rubber to fit snug inside the frame.
Clean the mesh on the screen printing frame with soap and water and let it dry overnight. In a photography darkroom, coat both sides of the screen printing frame with photo emulsion with a squeegee or stiff piece of art board. Scrape off any excess drippy emulsion. Set the screen face down in a dark place to dry.
Create a film positive of the design you want to put on the silk screen frame. Print your design on a piece of clear vellum paper. This is called a film positive.
In a darkroom, place the foam rubber face down on a flat surface. Place the screen face down over it, fitting the foam rubber inside the screen. Put the film positive face down centered on top of the screen. Place the glass over the film positive. The glass should be big enough to cover the silk screen frame.
Hang a halide light 18 inches over the glass. Turn the light on to expose the screen to the design. Turn off the light after eight minutes. Rinse both sides of the silk screen frame with warm water under medium pressure until the design appears. Blot both sides of the exposed image with newsprint to remove excess emulsion.
Place the screen in the sun or a well-lit area to dry. Once dry, the screen may be used for screen printing, also known as silk screening.