Over the course of time paper, parchment and artists’ media deteriorate by undergoing chemical and physical changes. One set of changes in objects often leads to another and on the whole if neglect sets in, the damage can be irreversible.
These are some of the problems that may arise:
Damp / mould which can destabilise the pigment and cockle the parchment or paper support
Humidity and temperature changes
Acid damage
Wood burn caused by poor quality mount board
Paper mites
Wood worm
Staining caused by foxing
Sunlight
Air pollution
Poor hinging methods within the mount such as sellotape and masking tape can cause terrible damage