alkaline-reserve paper

n. Paper containing a buffering agent to counteract any increase in acidity resulting from aging or interaction with the environment.

Notes

Calcium or magnesium carbonate is often used as the buffering agent.

Citations

Roberts and Etherington 1982 Papers which are to remain acid free for long periods of time, e.g., 500 years, should have approximately 3% precipitated carbonate by weight of paper.