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The Declaration is actually kept in argon gas, not helium, with a little humidity to keep the document from becoming brittle. Argon gas is an inert gas and will not react chemically with any other chemicals in the ink or parchment of the document itself to harm it.

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Q: Why is the declaration kept in helium?
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How is the declaration of independence perserved?

It is kept in a sealed case filled with argon gas at the National Archives Building in Washington, DC

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The Bill of Rights, the Declaration of Independence, and the Constitution are all stored in Independence Hall. (in Washington D.C.)

Why were the names of the signers of the Declaration of Independence kept secret for over two months?

they would try to get more before the king found out

What gas are the Declaration of Independence and the US Constitution stored in?

They are kept in the inert gas argon with a slight humidity to keep the documents flexible.

What special lighting preserves the Declaration of Independence?

I don't believe it's the lighting that is preserving the document. The case in which the document is in is filled with helium to protect it from the oxygen in the air which causes the deterioration.