A superior choice for preserving and showcasing your valuable prints, documents, and photographs, the Archival Methods Museum Board 17x22 Bright White 2 Ply PKG 25 is meticulously crafted from 100% pure cotton fiber pulp, ensuring a product of the highest quality. This bright white museum board boasts a neutral tone, providing a versatile backdrop for a variety of artworks. Designed with longevity in mind, this museum board is acid-free and lignin-free, incorporating both internal and external alkaline sizing for added protection. It's buffered with calcium carbonate, which safeguards your precious works from the harmful effects of acid migration and environmental pollutants that could potentially lower the pH of the mat board over time, making it more acidic. The Archival Methods Museum Board is free from optical brightening agents, ensuring the integrity of your artwork is maintained. With a thickness of 2-Ply / 30 Pt. (Approximately 1/32"), this board provides a sturdy and reliable support for your pieces. The manufacturing process of this museum board is environmentally conscious, excluding the use of post-consumer waste recycled pulp, metal particles, waxes, plasticizers, and residual bleach peroxide. The sulfur content is less than 0.0008% reducible sulfur, while the iron content does not exceed 150ppm and copper does not exceed 6ppm. The color dyes used are light-fast and non-bleeding, ensuring the board maintains its bright white hue ov