Which gas replaced helium as the choice to preserve historical documents?
Question #106131. Asked by Datsmeharse.
gonnzo
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gonnzo 17 year member
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Answer has 4 votes.
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In the U.S. at least...
"Since 2001 the American National Archives stores important national documents such as the Declaration of Independence and the Constitution within argon-filled cases to retard their degradation. Using argon reduces gas leakage, compared with the helium used in the preceding five decades."
https://en.wikipedia.org/wiki/Argon#Preservative