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.
Look for "internally and externally sized" papers (like Accademia ), which allows the surface to handle ink or wet media without excessive bleeding. 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