Arches watercolor paper has been a favorite among artists for over 500 years, and it's easy to see why! Manufactured in the same French mill since 1492, For more than five centuries! Made from 100% cotton linters and both internally and externally gelatin sized. Durable acid-free, pH-neutral and air-dried paper, Arches Aquarelle acid free watercolor paper is one of the finest art papers in the world.