The "Leonardo" is high quality 100% cotton, heavy weight, Mould-made watercolour paper. The blocks are glued and Gauzed on 4 sides ensuring flatness when wet. The "Leonardo" is suitable for all watercolour techniques, especially wet on wet painting and glazing. The fine grain structure allows for excellent t colour flow, while the Surface sizing permits corrections. The Board is acid and lignum free, making it extremely resistant to aging.