Designed with 10 mil naturally bright white base, Epson Proofing Paper White Semi matte is free of optical brighteners and ideally suited for proofing a wide variety of color critical commercial offset printing applications most commonly used in high-end sheet fed printed products such as brochures, collateral, book covers and posters. Coated with exacting standards, Proofing Paper White Semi matte is specifically optimized for proofing applications using Epson UltraChrome K3 ink and displays outstanding short term stability. Its weight, base tint, and wide color gamut makes this the perfect choice for commercial proofing applications. Like all of Epson's innovative media, this paper is engineered to give you the highest resolution and color saturation possible. As always, EPSON supplies guarantee EPSON quality.