Nigrescence

Pronunciation: /ˈniˈdʒiˈɑɹˈɛsˈsiˈɛnˈˌsii/

Nigrescence (noun)

  1. The process in which something becomes dark or black in colour.
  2. A chemical change that produces a dark substance or surface.

Examples

  • The nigrescence of the material happened after long exposure to light.
  • Nigrescence can occur when pigments slowly lose their brightness.