Leading authorities on image preservation recommends using glazing that blocks at least, 97% of UV energy. This is according to the Consumer Guide to Materials for Preservation Framing and the Display of Photographic Images © 2010 Image Permanence Institute, guidelines from the International Organization for Standardization, ISO 18902.
All light sources emit harmful UV light rays. Sunlight and indoor lighting, such as fluorescent and tungsten, contain different amounts of UV energy that can cause irreversible damage to artwork. Colors may fade and shift and the materials that make up the piece may become brittle.
Download the complete Consumer Guide to Materials for Preservation Framing and
the Display of Photographic Images © 2010.