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Diazo Photo Emulsion from Speedball is a great way to start photo emulsion screen printing. When mixed with a photo sensitizer the Diazo Photo Emulsion changes color from blue to green allowing you to know when it is fully mixed. Simply apply to both sides of the screen and let dry. Place your image on the screen and expose to light. Areas of the screen that are exposed to light will harden and bind to the screen while blocked out areas will be washed away creating the print on the screen. Ideal for t-shirts, patches, posters, and more.