from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To remove the acid from or reduce the acid content of.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To remove or neutralize the acidic content of
Index bibliobull, deacidify this is why i drive a truck - new desk
Ideally you want to deacidify it, and then store it sandwiched between acid free paper in an acid free box, in a deep dark acid free hole and never open the box again.
When in doubt deacidify it, you aren't gonna hurt it, if it doesn't need it.