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lightfastness
Lightfastness is a property of a pigment or paint that describes how resistant to fading it is when exposed to light. Light striking a painted surface can alter or break the chemical bonds of the pigment, causing the colors to bleach or change, in a process known as photodegradation. Materials that resist this effect are said to be lightfast.
==Standards==
Some organizations publish standards for rating the lightfastness of pigments and materials. Testing is typically done by controlled exposure to sunlight, or to artificial light generated by a xenon arc lamp. Watercolors, inks, pastels, and colored pencils are particularly susceptible to fading over time, so choosing lightfast pigments is especially important in these media.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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