Although papyrus falls outside the scope of the PSAP, here are a few key aspects of the material that should help to distinguish it from paper.
Papyrus is a paper-like material that was used over several thousand years, seeing its greatest popularity from 4th century B.C. to 4th century A.D as a writing support in Egypt, Greece, and Rome. Papyrus production involves cutting or peeling the papyrus reed plant into long strips. Strips were then soaked, rolled, and placed into overlapping layers, then pressed and left to dry to form sheets or rolls. Starch paste may have been used to strengthen the cross-lamination of the layers. Superior grades of papyrus come from the center of the plant, which appears brown in color. Papyrus formed from strips of the outer edges of the plant will generally appear more yellowish-white.
Many American and European museums and private collectors began to acquire papyrus artifacts during the 19th and 20th centuries. In this period, many curators stored papyrus between glass sheets or mounted it with acidic paper, films, and adhesives. Unfortunately, these housing and mounting techniques prove detrimental over time to papyrus, causing staining, embrittlement, and irreversible changes to the artifact.