Infamous supply in the world of animators - this paper is the medium of choice for background artists and is used extensively in Japanese anime studios, most notably Studio Ghibli (My Neighbour Totoro) Used with poster paints, the paper surface has been formulated to be water resistant, very smooth to help with line work and more practically so it can be scanned in, hardwearing to withstand erasers and avoid any bubbling and finally facilitating gradation. Of course it can be used with a wide range of media too, including watercolour, gouache, inks...