Premium Stonehenge Aqua Coldpress White Watercolor Blocks. A 100% cotton, acid-free, archival, and flat-drying block for mixed media, flawless washes and bright colors. Stonehenge Aqua Coldpress White Watercolor Blocks deliver professional quality at an affordable price. Made with 100% cotton, acid-free and chlorine-free, these blocks stay flat and dry flat. Perfect for wet-on-wet or wet-on-dry, they allow effortless blending, crisp detail, and clean lifting. Masking fluid adheres without damage, and colors stay bright after drying. Product Details: • 100% cotton, acid-free, archival, and chlorine-free • Coldpress/rough surface ideal for washes, detail, and layering • Flat-drying blocks prevent warping and buckling • Bright colors stay vibrant after drying • Handles wet-on-wet and wet-on-dry techniques • Easy blending, clean lifting, and crisp detail • Internally and surface sized to prevent bleeding & feathering