The oils and salts in perspiration will damage the paper fibers and leave stains that are extremely difficult to remove. It is best to wear clean cotton gloves while viewing your collection. Always provide adequate support for the paper and handle it with both hands. Never lift a piece of paper by its edges, particularly if there are any tears present. Paper clips, binder clips and post-it notes should not be used on works of art.
Metallic clips can corrode and leave rust stains on the paper surface.
Post-it notes can damage the image or paper surface. If a piece is too large to store flat, roll it into a large diameter tube. Don't store your collection in a place where there are extreme changes in temperature or humidity, and be sure it is out of the reach of insects and rodents. Unfortunately, nearly all framing in the past included materials that damage and eventually destroy paper. If you acquire a framed piece, it must be dismounted from the frame and examined for potential damage.