The popular Post-It notes and other brands of self-adhesive “sticky notes” may be great for leaving a quick note for yourself or a friend, but they are definitely not for use in books and original historical documents. The paper used in the product is not acid-free, and the adhesive on them contains chemicals which can leave behind a residue that can damage and/or discolor anything to which it is applied. Don't use these products on any historical documents, photographs, books, or any other materials in libraries, archives, or on materials in your personal collection that you wish to preserve for posterity.
