i know for a long long time orth-based film emulsions were king. roll film, plates, and sheet film were all ortho. now, unfortunately there are only a small handful of ortho films out there ... would it be less expensive ( not b/w dyes needed ) to have ortho film made rather than now-traditional pan-film? i really like the look of orthochromatic emulsion, and would love to have choices other than lith film, or paper negatives. i have coated film base with bottled emulsion before, but my efforts were not very successful.