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Here's the finished plate. This one has two layers of Imagon film; layer #1 a dot screen exposure and layer #2 the image. I could proof the plate now but it's getting late and I'd be better off starting fresh in the morning.
There are good step by step instructions for using Imagon film in Keith Howard's books. Book one is titled Non-Toxic Intaglio Printmaking (one of my prints is on page 26) and his second book is The Contemporary Printmaker.
It's important to remember that you need access to a good exposure unit with a vacuum frame. Look on line and you may get lucky like I did and find one with plenty of life left in it. Also, most classrooms and print studios usually have one these days since there's been an emphasis on less toxic printmaking processes.