I am trying to make film-based zone plates and need a high contrast image on a very clear film base. So far, I've tried Arista APHS Ortho Litho film with the Arista A/B lith developer, and Adox Bluefire Police film with the Arista A/B developer and LPD paper developer. The lith film yeilds very high contrast, but the base is not as clear as I'd like. The Bluefire film has a very clear base, but isn't as contrasty. Is there a particular developer that I should try with the Bluefire film to produce its maximum contrast? D-19? Something else? Should I consider another film/developer combination? TIA Chris Ellinger Ann Arbor, MI USA ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.