blued

1. 1
   verb

   Past tense and past participle of blue. Use it for the past, or after has, have, had, is, was or were.

   The gunsmith blued the barrel to protect it from rust.

   She blued the dingy sheets so they looked bright white again.

   Note
2. 2
   adjective

   Covered with a thin protective layer that keeps metal from rusting.

   Like a thin shield on the metal that keeps rust away.

   The blued screws on the old clock had not rusted at all.

   A blued knife blade looks dark gray instead of shiny.

   Similarblackened

   Note

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