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All wavelengths of light – visible, infrared, and ultraviolet (UV) – promote the chemical decomposition of organic materials through oxidation. Higher-energy ultraviolet is the most harmful.
However, light in all its forms, especially in the presence of atmospheric pollutants, leads to a weakening and embrittlement of cellulose, adhesives, cloth, and skin materials.
Light can cause some papers to bleach and others to yellow or darken; it can also cause media and dyes to fade or change colour, altering the legibility and appearance of documents, photographs, art works, and bindings.
The following factors concerning light should be known by all those responsible for preserving library material:
|© 2005 University of Oxford · Training/Environment/Light page 1 · Modified by EpA ·|