The Andalucia block contains very thick paper that stays flat when wet, ensuringan even flow of paint when using watercolor, gouache, tempera or acrylic.Each 9-1/2" x 12-1/2" sheet of 500gm/m2 paper exhibits a duplex finish— rough-textured on the front and smooth and matte on the back. The Hahnemühle Andalucia Block is made of 12 sheets of high quality, natural white paper, acid-free and UV-resistant.