text: Chromic phenomena are those phenomena in  which color is produced when light interacts with materials, often called chromic materials in a variety of ways. These can be categorized under the following five headings:
  *Stimulated (reversible) color change
  *The absorption and reflection of light
  *The absorption of energy followed by the emission of light
  *The absorption of light and energy transfer (or conversion)
  *The manipulation of light.