Archivists Are Rescuing Old Manuscripts Using Dry Ice

Illustration for article titled Archivists Are Rescuing Old Manuscripts Using Dry Ice

In their battle against time, archivists have picked up a new weapon to bring back old manuscripts: dry ice.

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One of the big problems in preserving papers, or getting a closer look at old, salvaged papers has been figuring out how to get beneath the grime of history to what’s waiting below. Obviously, the old standards of soap and water are far from ideal for cleaning paper. So what does an archivist do?

Commenter BuckCaldwell explains how that same tech that NASA scientists are using to clean telescope mirrors is also getting used in libraries:

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I’ve seen this done on books and other (very old) paper materials. Essentially sand-blasting with dry ice. Since the dry ice is softer on Mohs scale than the paper or the ink, and sublimates immediately upon impact to gas, it doesn’t harm anything, but the energy of the impact and sublimation will dislodge dirt from the surface. Fascinating stuff one never thinks about. Kudos who whoever thought it up.

And it’s not just for documents dirtied-up by time; it can also clean up paper from much more recent encounters. After a fire swept through Utah’s historic courthouse in 2006 (which also doubled as a storage chamber for its 200-year-old collection of documents), the technique was also used to get the soot and smoke out of the pages and canvas.

Image: Ivo Petkov / Shutterstock

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DISCUSSION

michaelwalsh01
Michael Walsh

Some years ago there was a disastrous flood in the basement of the Chicago Historical Society, soaking decades of old newspapers and other documents. The solution was to send them to the Kitchens of Sara Lee, the maker of frozen coffee cakes and pastries. The papers were chilled in their giant freezers to prevent further damage. They were then shipped to a facility in the east where a vacuum method extracted the water, a bit like the process for making instant coffee. Most of the papers were saved.