These watercolor blocks contain mold-made paper of 100% cotton, double-sized, acid-free/neutral pH, chlorine-free with four deckle edges. The traditional white shade is produced without the use of optical brighteners. Ideal for watercolor, tempera, gouache acrylic, link, charcoal, graphite and drawing. It is also suitable for printmaking. Available in watermarked cold-press, hot-press and rough surfaces and in 200 gsm/90lb., 300 gsm/140lb. and 640 gsm/300lb. weights.