I know this is supposed to be about paper negatives, but you may find this interesting.
In a previous post I talked a little about stripping emulsion from RC paper negatives. This technique can also be used with finished prints. One application for this procedure is to mount photos onto stretched artist canvas. This was a popular in the 70's, as the finished product had the look of a painting. Portraits and landscapes were the most common types of photos to be used. This is done with FB paper, and is quite a bit more difficult to accomplish.
The method is the same as with RC paper, greater care must be exercised, as the emulsion on FB paper is so much more fragile than RC paper.
Good luck, and happy printing.