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 commercial lettering, and photographic half-tone positives. The photo emulsion method requires: 1) a screen prepared with the photo emulsion/sensitizer mixture; 2) a film positive or a printed transparency film; 3) a light source that will transfer the opaque images on your positive to the light sensitive printing screen. The Diazo Photo Emulsion Kit contains a 7oz jar of photo emulsion, an 8oz jar of photo emulsion remover, and a 1oz bottle of condensed sensitizer (the sensitizer bottle appears empty, but actually contains condensed sensitizer that is to be filled halfway with water and mixed well). Three-year shelf life unmixed.