A Chinese court robe that has faded from long years of exposure to high light levels on exhibit. Because it was folded, the robe has faded unevenly; part of the sleeve on the right was protected from exposure and maintains the silk’s original bright color.

Light is a form of energy that can cause severe damage to specimens and objects. Exposure to both the visible and the invisible, or ultraviolet, portions of light will cause damage. Organic materials are most susceptible to light, but dyes, paints and other inorganic materials can also be affected. Damage from light is cumulative and irreversible.