Acid-Free Paper

Acid-Free Paper or banknote paper. It is made from plant fibers that are processed into cotton pulp after a special chemical treatment. This kind of paper has high strength and has a folding endurance of thousands of times. Not only that, this kind of paper can be identified by the PH test pen, which is what we often call the money detector pen. The money detector pen is blue or purple on plain paper, and yellow on acid-free paper.