I only use tiny bits at a time. I print the image I want onto plain paper, then cut a bit of pnp to fit the image plus a little bit and tape the leading edge down with sellotape so the pnp just covers the image before reprinting on manual feed. There can be the odd bit that's imperfect, so I just go over that with stopout varnish (and a very tiny paintbrush) whilst I'm doing the back and edges of the piece.
I've never bothered trying to recover the silver from ferric, though I'm sure it's possible.
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