Arches Watercolour Paper are with 100% cotton 640 GSM - 23 cm x 31 cm or 9' x 12' - Fine Grain - Natural White paper. Made on Cylinder mould; gelatine sized; Ph- neutral; Chlorine Free; acid-free and air-dried. With alkaline reserve; no optical brightening agents; fungicidal treatment to prevent the appearance of mould, Sheets have two natural deckle edges, two torn deckle edges and are watermarked and embossed. Permanent in accordance with ISO 9706; Ideal for watercolour painting, as for all wet techniques such as ink, gouache and acrylic. Manufactured with advance printmaking technology with traditional techniques; has a look and feel of vintage handmade paper; strong enough to handle multiple washes of colours without damage to surface.