Approximately 3 - 4mm max. Otherwise open bite will occur. The plate will not keep the ink. If you do have a screen then of course you can use large solid black areas and get a nice results. The plate is reworkable with a drypoint needle or a mezzotint rocker, but as the film has hardened you need to be careful for it might chip off. I have experience with ImageOn HD and DK films.
helen tago Jul 28, 2016 2
Photopolymer without a photo
Photopolymer film can be used to make plates without the photographic transparency. You can use marker drawings, ink, leaves, paper cutouts. Just keep in mind that for a printable image (and without the proper stochastic screen) you have to keep the lines thin.
The testplate above was made using photo transparency, marker lines, dried plants and printed text.
Line drawings do not need a screen to hold ink but need to be as opaque as possible to guarantee the best quality of line.