Quote Originally Posted by holmburgers View Post
thanks guys,

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.


hey holmburgers -

the way the gelatin tintype plate worked is just like you are talking about
the emulsion was painted on a black surface ( blackened tin, black glass )
made the exposure and then bleached it +fixed it.
rockland colloid's process works the same way ...

the clear bits don't bleach at all ( nothing there, so they show the black behind it ) and
the black bits get lighter/bleached ... the mid tones stay around the same.

i am sure if you put some of your azo emulsion on something black you could probably do the something similar ...
without exposing yourself to cyanide

good luck!
john