The demanding techniques of water colour painting require high performance papers, specially sized to accept colour and withstand repeated application of washes. All watercolour papers and boards selected by Daler-Rowney are made from the highest quality wood pulp and cotton fibres, and they are all acid-free to prevent discoloration over time. The surface texture of watercolour paper plays an integral part in the overall character of the painting.12 sheets watercolour pad. Acid Free 297mm x 210mm 140lbs,300gsm Grain Fin. NOT surface (sometimes known as cold pressed) which is in between the roughest and smooths texture of papers.