Ensure you have the perfect base for your watercolour projects with this watercolour not imperial a1 boardt all watercolour papers and boards selected by daler rowney are made from the highest quality wood pulp and cotton fibres and theyre all acid free to prevent discoloration over timethe surface texture of watercolour paper plays an integral part in the overall character of the painting and the un imperial surface of this paper is multi grain for a variety of watercolour techniques the