Coin Books & Storage Specifically Pennies

To CCF! . I would just spend them, as there's nothing you can do to save them.

to the Community!

Your post was moved to the appropriate forum for the proper attention.

Storage location is a factor. You want low humidity and stable temperature. Cardboard soaks up moisture which is eventually released back onto the coins.

From my experience with zinc cents, the main thing is to protect them from moisture. So, desiccant packets in an air-tight container may help for bulk storage. I've got around 25 pounds of zinc cents in an air-tight food storage container that I set aside from circulation as I found them in AU and BU condition decades ago. They still look as good as the days I hoarded them away. And there is no desiccant in the container, it's just air tight and hasn't been opened in years.

For zinc cents that are part of my collection, I put them in capsules. So far, that is working out just fine. Zinc cents are not doomed to zinc rot if they are properly housed.

Cardboard-based books that advertize as archival quality, such as Dansco and Intercept Shield also offer improved protection, assuming those books are housed where they are not exposed to high heat and humidity.