Is it Acid Free???
You can test your papers to see if they are acid free by picking up a PH tester, such as Provenance's PaperSaver pen, and follow the instructions. Then, if necessary, treat your paper with an acid-neutralizer like Provenance's PaperSaver spray, EK Success's Archival Mist, or Krylon's Make It Acid-Free spray. You should be able to find these or similar products at you local scrapbook and/or craft store, or order on-line.