A recent inquiry came to me regarding the archival nature of commercial papers and other additions of non-fine art products added into paintings. There is something you can do to reduce the fading of printed papers. Golden has two products which both have UV protection, and are made especially to help increase the longevity of inks and other colors. There is a UV Gel that comes in Gloss or Satin. Apply this over the papers. The more layers of this you use, the more protection. There is also a spray varnish called Archival Varnish, which comes in gloss, satin and matte. Several sprays would equal one brush application of the gel, in terms of protection, so I recommend spraying at least 4 times.