The Frame Maker just came across this excellent article on preservation of art and other irreplaceable items on paper in terms of matting and framing, published by the Library of Congress.
In addition to some great specifics for framing your art that we have always recommended (like becoming an educated consumer before you go into the frame shop), this article also gives a solid overview of framing materials and this spiffy exploded diagram of a complete archival framing package that is very useful for anyone who’s never considered what goes on inside a frame.
Archival framing diagram courtesy of the Library of Congress
We also appreciate the sound advice about where to hang your completed custom frames (and where not to) in order to ensure the longest life of the valuable items in your collection. Check out this great article on preservation framing here.