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  2. Bluing (steel) - Wikipedia

    en.wikipedia.org/wiki/Bluing_(steel)

    Rust bluing was developed between hot and cold bluing processes, and was originally used by gunsmiths in the 19th century to blue firearms prior to the development of hot bluing processes. The process was to coat the gun parts in an acid solution, let the parts rust uniformly, then immerse the parts in boiling water to convert the red oxide Fe

  3. The Best Tape Guns for Sturdy Seals - AOL

    www.aol.com/best-tape-guns-sturdy-seals...

    Make your life easier with a tape gun. An essential item for any work space or home, tape guns make sealing boxes a simple task. Invented in 1932 by an engineer at the 3M Company (which remains ...

  4. Bluing - Wikipedia

    en.wikipedia.org/wiki/Bluing

    Bluing (steel) is a passivation process in which steel is partially protected against rust Bluing may also refer to: Bluing (fabric), a blue dye used to improve the appearance of fabrics; Bluing (hair), a blue dye used to improve the appearance of hair "bluing" of machine parts to check for tolerances, see engineer's blue

  5. Talk:Bluing (steel) - Wikipedia

    en.wikipedia.org/wiki/Talk:Bluing_(steel)

    Black oxide is but one type of bluing for firearms; there are other types of bluing used on firearms, too. (Hot bluing vs. cold bluing, and hot bluing versus "hot and cold" mixed bluing, for example.) Black oxide is also used to refer to thicker bluing that is black oxide based.

  6. Black oxide - Wikipedia

    en.wikipedia.org/wiki/Black_oxide

    The NaOH (caustic soda) and elevated temperature cause Fe 3 O 4 (black oxide) to form on the surface of the metal instead of Fe 2 O 3 (red oxide; rust). While it is physically denser than red oxide, the fresh black oxide is porous, so oil is then applied as post treatment to the heated part, which seals it by "sinking" into it.

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  8. The 9 Best Sale Items at Costco Right Now - AOL

    www.aol.com/9-best-sale-items-costco-200246923.html

    $5.50 off each 24-pack of 16.9-ounce bottles. If you're tackling Dry January, San Pellegrino sparkling mineral water is a great way to mix things up.The 24-pack of 16.9-ounce bottles is $5.50 off ...

  9. Russia tells its citizens: avoid travel to the West - AOL

    www.aol.com/news/russia-tells-citizens-avoid...

    Some Russians are in jail in the United States and dozens of U.S. citizens are in jail in Russia, convicted of a range of crimes ranging from espionage to hooliganism - even after the biggest ...