Arches Aquarelle watercolour paper is acid-free and chlorine free, made of 100% cotton fibres which provide strength and stability. The paper is tub sized in natural gelatine and air dried - it can take scrubbing, scratching and erasing while keeping the original intensity of the watercolour. Arches Aquarelle uses no optical brighteners so its natural white colour will not yellow with age and archival value is ensured. Arches Aquarelle is excellent for watercolour, gouache, pen and ink, acrylics and calligraphy.