Usually means: Chemicals that make fabrics appear whiter.
Definitions Related words Mentions
We found 5 dictionaries that define the word Optical brightener:

General (3 matching dictionaries)
  1. optical brightener: Oxford Learner's Dictionaries
  2. optical brightener: Collins English Dictionary
  3. Optical brightener: Wikipedia, the Free Encyclopedia

Tech (2 matching dictionaries)
  1. PhotoNotes Dictionary of Film and Digital Photography (No longer online)

Definitions from Wikipedia (Optical brightener)

noun:  Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) through the phenomenon of fluorescence.


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