Tim Holtz Alcohol Ink YUPO is a versatile surface specially suited for watercolor and mixed media techniques using Tim Holtz Alcohol Inks, Mixatives, and Blending Solution. YUPO white heaystock is a smooth, synthetic, ultra-heavyweight 86 lb surface that resists buckling and dries quickly. Non-porous, water resistant surface. Not laser or inkjet compatible. This inch package contains five 8x10 inch sheets of white heavystock.