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Submerge them in drawers filled with Argon or Xenon gas when filing them away. This would also help to fireproof the artifacts.


Nitrogen should do just as well.

The hazard is if the inert gas displaces oxygen in the storage facility. That can make them a death trap.


Or the banks of rivers or in the sea? We seem to find very old artifacts there!


Xenon is quite expensive.


Cheaper noble gases exist. And nitrogen will probably be fine.


How about a tar pit




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