This won't be a complete lesson, just a series of blips that will show the highlights of making the photo-fresco / cement molds using screen printing. The first issue is getting an image and increasing the contrast using photoshop of some of program or method to make a film. The film is used to make a screen. The higher the contrast the less need there is for a halftone. A halftone is a series of dots that emulate shading in photos and is a typical method of making prints for reproduction. Here is a film of a Bruce Lee photo I found online.
The film is applied to a photo-sensitized screen and exposed to light. After the exposure the screen is washed out and porous areas are shown as clear spaces on the screen. These areas allow ink or other materials to be pushed through and work like a stencil for printing multiple pieces with the same graphic.
The screen should dry completely and the sunshine works great to continue to harden the emulsion. At this point you can use the screen for making a mold of the design.
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