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Telling an old book by its smell: Aroma hints at ways of preserving treasured documents

Date:
November 13, 2009
Source:
American Chemical Society
Summary:
Scientists are reporting development of a new test that can measure the degradation of old books and precious historical documents from their smell. The nondestructive "sniff" test could help libraries and museums preserve a range of prized paper-based objects, some of which are degrading rapidly.
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Old books give off an unmistakable, musty odor. Scientists have developed a new test that can measure the condition of old books and precious historical documents on the basis of their aroma.
Credit: Wikimedia Commons

Scientists may not be able to tell a good book by its cover, but they now can tell the condition of an old book by its odor.

In a report published in the American Chemical Society's Analytical Chemistry, a semi-monthly journal, they describe development of a new test that can measure the degradation of old books and precious historical documents on the basis of their aroma. The non-destructive "sniff" test could help libraries and museums preserve a range of prized paper-based objects, some of which are degrading rapidly due to advancing age, the scientists say.

Matija Strlič and colleagues note in the new study that the well-known musty smell of an old book, as readers leaf through the pages, is the result of hundreds of so-called volatile organic compounds (VOCs) released into the air from the paper.

"The aroma of an old book is familiar to every user of a traditional library," the report notes. "A combination of grassy notes with a tang of acids and a hint of vanilla over an underlying mustiness, this unmistakable smell is as much a part of the book as its contents. It is the result of the several hundred VOCs off-gassing from paper and the object in general. The particular blend of compounds is a result of a network of degradation pathways and is dependent on the original composition of the object including paper substrate, applied media, and binding."

Those substances hold clues to the paper's condition, they say. Conventional methods for analyzing library and archival materials involve removing samples of the document and then testing them with traditional laboratory equipment. But this approach involves damage to the document.

The new technique -- an approach called "material degradomics" -- analyzes the gases emitted by old books and documents without altering the documents themselves. The scientists used it to "sniff" 72 historical papers from the 19th and 20th centuries. Some of the papers contained rosin (pine tar) and wood fiber, which are the most rapidly degrading types of paper found in old books. The scientists identified 15 VOCs that seem good candidates as markers to track the degradation of paper in order to optimize their preservation. The method also could help preserve other historic artifacts, they add.


Story Source:

The above post is reprinted from materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Strlic%u030C et al. Material Degradomics: On the Smell of Old Books. Analytical Chemistry, 2009; 81 (20): 8617 DOI: 10.1021/ac9016049

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American Chemical Society. "Telling an old book by its smell: Aroma hints at ways of preserving treasured documents." ScienceDaily. ScienceDaily, 13 November 2009. <www.sciencedaily.com/releases/2009/11/091110112446.htm>.
American Chemical Society. (2009, November 13). Telling an old book by its smell: Aroma hints at ways of preserving treasured documents. ScienceDaily. Retrieved August 29, 2015 from www.sciencedaily.com/releases/2009/11/091110112446.htm
American Chemical Society. "Telling an old book by its smell: Aroma hints at ways of preserving treasured documents." ScienceDaily. www.sciencedaily.com/releases/2009/11/091110112446.htm (accessed August 29, 2015).

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