Jo, You might find a library with an archival specialist (old stuff books) I took some deguerrotypes that were mostly gone and they photographed them and they look pretty good. This was Brigham Young University Archive Library. They were interested in that time period and Ontario Co NY so it was free. Photos are at Whitney photo site Ami Whitney taken abt 1859 and Ami Jr. (don't know the link off hand Good Luck Gary Wallace