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What are compression fitting spanners coated with?

What are compression fitting
spanners coated with?

Shop for Compression Fitting Spanners

Black oxide wrench Some compression fitting spanners have a black oxide coating.

Black oxide coating

Black oxide chemical kit A black oxide coating is created when the iron in the metal reacts with a combination of sodium hydroxide, nitrates and nitrites to cause a chemical reaction.
Black oxide spanners The oxide coating does not affect the strength, weight or thickness of the object but does leave a decorative black finish which can give the tool a look of quality.
Black oxide compression fitting spanner The advantage of using a black oxide coating on a compression fitting spanner is that it gives the tool a corrosion resistant surface which it does not gain from the drop forging process alone.

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