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Petrified dinosaur poo. :p

It's only slightly different chemically from nitro-cellulose gunpowder. IF I recall the story correctly, the original formula for celluloid was created to imitate the ivory that was used in billiard...

Best thing is air circulation to keep the acid fumes from being concentrated. I don't store any of cell handled knives in my knife roll. Individual wrappers are good if you have to keep all of them...

More often than not, celluloid is its own worst enemy. If it wasn't made EXACTLY right it'll go South no matter what you do to preserve it.

Remington had their own version of celluloid at one time...