Properties of Parchment
Parchment is hygroscopic. As such, environmental conditions such as humidity must be kept under control. Pigments add another layer to the problem, forcing a preservationist to fit environmental conditions to two different (and possibly conflicting) sets of ideal limits.
Problems can occur when parchment is exposed to high humidity for a long period of time. For example, collagen in the pages could dissolve and stick together.
These problems are further compounded by the fact that pigments do not dye parchment; instead, they lie on the surface of the parchment and so are rather fragile. Pressing an illuminated manuscript pushes the pigment down, altering the image itself and likely causing damage (such as a relief effect to the other side of the page) so it is very important to not put any pressure upon images on parchment, especially when it is wet. This fact also has to be taken into account when cleaning dirt from the image and when encapsulating or framing illuminated parchment for an exhibition. There must be enough room between the image and the protective surface (such as Perspex) that the image will not be subject to rubbing if the parchment should expand with rising humidity.
Read more about this topic: Preservation Of Illuminated Manuscripts
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