I have about 1500 negatives that my Grandfather took in China between 1913 and 1952 (he was a missionary). Many of the negs are dirty and scratched, some are stained from the negative books they were stored in. I want to clean and print them, but am concerned about the stability of the negs (emulsion separating, etc.) I have scanned most of the best negs, and am now ready to begin printing. Any ideas about how I should go about cleaning/preserving the negs? Also, I am looking for funding for a possible exhibit/book. Any ideas about sources?