What about full exposure, and weak development? IDK... just throwing that out there.
I was thinking that you could mount it with the base facing out for protection, and to see it in proper orientation, and then put something dark behind it. Imagine coating emulsion on obsidian!
john, are you talking about taking a full neg and then reducing it?
I'm hoping someone with some collodion expertise might chime in; I'm really curious about the differences between an otherwise identical collodion emulsion, but the 2 different developing procedures.