Beginning in 1987, using camera equipment developed for the Hubble Space Telescope, preservationists were able to monitor the Declaration for even the most minute signs of fading or flaking ink.
The measures proved effective, so much so that the Declaration outlived its original protective case. After undergoing careful inspection for further erosion in 2003, the document was resealed in a titanium casement filled with inert argon gas. Similar preservation techniques are used to protect the Bill of Rights and Constitution.
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