Made the traditional way, on a cylinder mould, this paper has a harmonious natural grain. Thanks to this method, the fibres are evenly distributed, the paper slackens uniformly when wet. Its composition with long fibres of 100% cotton gives the paper its strength, and a natural, lasting whiteness. Arches is heavily gelatin sized internally and externally and this provides a very hard and durable watercolour paper - it also preserves the lustre and transparency of the colours whilst preventing paints from penetrating the paper. It allows superposing of washes and gives it added strength to resist erasing and scratching without tearing or linting and can absorb a large amount of water with limited deformation - especially the heavier weight papers.