This is paper with a neutral or basic pH (7.0 or higher), designed to prevent yellowing or becoming brittle over time. It is often referred to as "permanent paper" and is essential for long-term document preservation.
To be considered "proper" for archival or professional art use, paper should meet these standards: Acideria Talla
Some papers include a 2–3% calcium carbonate buffer to protect against environmental acids. This is paper with a neutral or basic pH (7