Speedball - Diazo - Photo Emulsion Remover - 8 oz - Speedball presents Diazo Photo Emulsion Remover! The photo emulsion method of screen printing is perhaps the most exciting method created! It makes fine line drawings, computer generated images, various hand and commerical lettering and photographic half-tone positives. The photo emulsion method requires: 1) Sreen prepared with the photo emulsion / sensitizer mixture 2) film positive or a printed transparency film 3) light source (we recommend a BBA 1 photo flood) that will transfer the opaque images on your positive to the light sensitive printing screen. DIAZO Photo Emulsion remover, when applied to the emulsion-coated screen, reclaims the screen with minimal cleaning effort.