Great idea! I was thinking about this using a Mylar material and a green, water soluble ink Sharpie so that the ink could be removed with a damp cloth. (If needed.)
As it turns out, I have a masking set with a punch and a contact printer with registration pins. I could cut Mylar sheets to exactly the same size as the interior of the contact printer and sandwich these sheets in the frame. (See photos. I would sandwich them so that the glass was between the Mylar and the negative.) In bright light, i could outline areas to be dodged or burned using the green Sharpie. I enlarge with VC paper. I was thinking that green would be least likely to cast a shadow, since it would be a low contrast "shadow".
Anyway, since a punched negative would always be positioned in exactly the same position with respect to the printing frame, I could keep these Mylar sheets with the negative for future printing.
Inkjet masks opens up many possibilities, especially with pin registration. (Scary.)
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