 ##  [Lightfastness](/index.php/lightfastness) 

  ##  [Lightfastness](https://humanitites.quantumdictionary.io/lightfastness-0) 

  
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**Humanities &amp; Arts Dictionary**

 
Definition

Degree to which a pigment, dye, coating, or material resists irreversible change in its perceived color or loss of chroma when exposed to a specified light source and duration, assessed under defined spectral, temporal and environmental conditions.