Canson XL Watercolour albums feature 30 sheets of 300 gsm student quality paper ideal for a variety of watercolour and wet techniques. This paper is acid-free with a cold pressed texture. Its surface formulation ensures an excellent wet erasability. Standard & Longevity guarantee Complies with ISO Standard 9706 acid-free and without optical brightness additives. Mould-resistant treatment. The XL WC Spiral Pad paper is colour stable mould made and acid free. The best watercolour papers are acid free to prevent the deterioration of paint and to preserve the integrity of the paper over time.It can also be used for pastels.inks designers gouache and acrylics.?