Saunders Waterford Watercolor Paper is an exquisite, superior quality watercolor paper, traditionally made on a cylinder mould by St Cuthberts Mill. Made from 100% cotton, the highest quality papermaking material, with high archival standards. Acid-free. Each sheet is protected with calcium carbonate to help protect the finished artwork from discoloration caused by acids present in atmospheric pollution (alkaline reserve. With a pH 7-9). The characteristic texture of its surface is created with natural wool felts, giving it an attractive random texture. The surface is gelatin-sized, making it strong and resistant to washing and other treatments. Deckle edges on all 4 sides.