Winsor Newton-Arches Watercolor Cold Pressed Paper Block. The ideal paper for all wet techniques including watercolor, gouache, ink and acrylic! The worlds best known fine art papers arches is mouldmade from 100% cotton linters. This gives them stability and strength and exceptional tactility. Arches papers are neutral pH which assures their archival quality. This package contains twenty 12x16 inch 140lb cold press sheets glued on four sides (allows paper to remain intact even when wet). Complies with ISO 9706. Acid free. Imported.