I've dug up 20 yr old 35mm Film Negatives. They are badly damaged with fungus and stains of unknown origin. I tried what some web sites suggested - wash in clean or even distilled water with very little detergent. Problem is that when the negatives dry, the fungus stains are visible.
So I thought, why not capture them when wet?
I hooked up my D700+105mm, put the negatives in a glass casserole dish of water, and lit from behind the photo with a flourescent tube and a remotely activated SB900. Doing it at f/8 or so takes care of the focus issues -- no need to be that precise.
Now it all worked rather well. The resulting photo is far better than a dry scan using my cheap USB scanner. I get far more resolution also.
(a) Any tips regarding this method, and
(b) Any idea what the precise settings I need to do to inverse the negative image/colours? It is definitely technically possible, but how?