English to English

noun (n)

• used to whiten laundry or hair or give it a bluish tinge(noun.substance)

  Synonym:
  blue, blueing
  

  source: wordnet30
• a process that makes something blue (or bluish)(noun.process)

  Synonym:
  blueing
  

  source: wordnet30
• The act of rendering blue; as, the bluing of steel.(noun)

  source: webster1913