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James, it is the standard "Blueing" which is actually black in color. It is a chemical oxide coating that adheres to the metal for rust protection.

Hi James, it is the standard "Blueing" which is actually black in color. It is a chemical oxide coating that adheres to the metal for rust protection.

For more information on steel bluing, visit: https://en.wikipedia.org/wiki/Bluing_%28steel%29

Bluing is a chemical "rust" coating that preserves the metal. it can range in color from a dull blackish grey to a deep blue (almost purple) and anywhere in between