Barcode on photographic print

I recently bought a nineteenth-century photographic print, which
when it arrived I discovered bears, on the verso of the (rather
thin) backing on which the photograph is mounted, a barcode-type
label. Two questions:

    1.  Am I correct in thinking that the self-adhesive of the label
        will eventually disintegrate and loosen but in the meanwhile
        will discolor and stain the backing, the stain likely
        migrating to the photograph itself?

    2.  How can I remove the label?

Donald Farren
4009 Bradley Lane
Chevy Chase, MD 20815-5238
301 951 9479
Fax: 301 951 3898


                                  ***
                  Conservation DistList Instance 20:44
                 Distributed: Wednesday, March 7, 2007
                       Message Id: cdl-20-44-006
                                  ***