SPEEDBALL-Diazo Photo Emulsion Kit. Photo Emulsion is one of the most exciting techniques of screen printing and offers a wide range of possibilities. This method allows for fine line drawings, various lettering techniques, and photographic half-tone positives. This package contains 6.6 ounces of Photo Emulsion, 1 ounce of Photo Emulsion Sensitizer, 8 ounces of Photo Emulsion Remover and detailed instructions. Printing screen, film positive or transparency film, and light source not included. Conforms to ASTM D4236. Made in USA.