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Acid Paper And Your Scrapbook
By Dustin Caro
To discover how effective the PaperSaver formula is on acid paper, we did a series of experiments using methods that the Library of Congress pioneered to protect their archives and standards long used in the paper industry.

This involved taking papers that were first tested for their acidity and then treating some with the PaperSaver formula, leaving some untreated for comparison. Then, their fold strength—a measure of paper performance—was used to see how effective the PaperSaver treatment was. Fold strength is how many times a paper can be bent back and forth without breaking. A variety of papers were used in these tests to evaluate the treatments, including different acid paper samples from two commercial sources and one from a local newspaper. To simulate the effects of aging on the paper, paper samples were exposed in ovens at temperatures that would boil water. Throughout the weeks of testing, individual samples were taken out and tested to see how their fold strength decreased as time went by. Some of this testing showed us that PaperSaver could be effective when applied to only one side of acidcontaining paper sheets. Since that could result in a major savings in time and materials, we also included paper samples treated with PaperSaver – but only on one side - in this study.

MIT Fold Testing Equipment used to test PaperSaver’s effectiveness.

What kinds of paper did we use?

The three paper samples in the study were:
• 25% cotton, 20-lb “fine business paper” produced by Southworth.
• 90 GSM, 24-lb basis, white woven paper produced by Crane’s Crest.
• Printed paper from the San Francisco Chronicle dated June 19, 2004.

How we tested
After treatment, paper samples were cut into individual matched strips and placed in a temperature and humidity controlled room at the University of California, Berkeley, in the Forest Products Laboratory for 30 days.

This allowed us to test under uniform conditions and chemistry for the deacidifying agents that we used. The next accelerated aging was conducted using dry heat (100° C and < 5% RH). After the 30-day conditioning treatment, the individual sample paper types were oven aged using either of two standard methods. The accelerated aging samples were removed weekly, reconditioned to standard conditions, and subjected double fold strength testing. We kept aging samples until samples were reduced to a “zero or near zero” fold strength. In other words, until the samples wouldn’t fold without

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