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 colour flow, while the Internal and Surface sizing permits corrections. The Board is acid and lignum free, making it extremely resistant to aging.