Regarding the negatives, I once used the harmonizing process that is in 
Photographic Facts and Formulas (bichromate bleach, redevelop in 
non-staining developer) to change the scale of a Polaroid negative, then 
copper toned it.  The negative looked really incredible, and gave a 
rather wonderful print on silver paper.  I would think this might work 
well with uv processes as well.  The color of the negative was well into 
the brown range.  
Larry Bullis
Skagit Valley College