17th-century samples with original fire damage
An original sample of heat damaged parchment (not part of the LMA collection) was found, and the magnet drying system was tested again. This was a good sample to test the treatment on as it had similar planar distortions and fragile edges as seen on the Great Parchment Book, which would not withstand having clips attached. (The sample was fully humidified between blotter and Gore-Tex®.)
This method worked really well. Stronger, larger magnets were used around the shrunken areas to help hold the creases open, and then weaker, smaller ones were used to hold down the torn, fragile edges. However some tears, that were already present, did become wider and more obvious. This was a natural reaction to the overall plane of the parchment becoming flatter, but should be avoided when treating the Great Parchment Book.