darkening

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  5. [processes and techniques by specific type]
  6. condition changing (processes)
  7. color changes
  8. discoloration
  9. darkening
Scope note
To make or become dark in shade, value, or color; a form of discoloration: the blackening or browning of materials due to such causes as chemical process, exposure to light, the passage of time.
darkening
Accepted term: 06-May-2024