Do I understand it right that the OP wants to make a reflective negative-image from silver, over a darkened background ? As per some old processes visually, if not chemically ?
In Europe at least, there is still some direct positive orthochromatic film from Maco available in sheets, for making copy negs etc. An enlarger print on that stuff, with suitable exposure and developing, could provide the silver image and then the background could be black paper, velvet, a hole-in-a-dark-box or whatever you want. An alternate would be a reversal process of ordinary ortho-sheet film to achieve the same result.
EDIT: It looks as though that direct reversal film has gone now, oops. Normal ortho sheet film with either a contact print or reversal-processing would the way to go. As I should have written above, I don't think trying to dye a commercial paper base would work very well, but coating your own might also be possible.
There were fiber based coloured papers made in Germany by either Tura or Labaphot (no black of course).
Tetenenal offered a system where it was intented to etch-off emulsion image-wise.
John - I'm not exactly sure of what you're trying to do, but what if you used LiquidLight on acetate?
Think so... but if I am correct, there is no need for direct positive or reversal... That is cool part; these processes produce positive images from (unchanged) negatives....
The point about using a direct reversal film is that you can use any negative you already have to make the 'print', and in whatever size you need, without having to be limited by an in-camera exposure.
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