Effect of Humidity Fluctuation on a Rare Book

The following video shows an experiment conducted at IPI to illustrate the physical effects that occur on library and archive materials due to changes in humidity conditions. In this example, a vellum bound book (Johann Hübner "Kurze Fragen aus der politischen Historia biß auf gegenwärtige Zeit" printed in 1701) was studied. The experiment started at an equilibrated condition of 55% relative humidity, then conditions were altered to 25%, back to 55%, and finally to 75%. The duration of the experiment was 12 hours and conducted at room temperature.