How to get a gunmetal finish

How to Nitre Blue Gun Metal for a Beautiful Finish | MidwayUSA Gunsmithing

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How to Turn Steel Black - All you need to know about Bluing

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Bluing Steel Parts Tutorial

Three Options For Bluing Steel

Blacksmith Shop Tip #10 "What's The Best Finish For Metal?"

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Jewelry 101: An Easy Way To Make Your Own Gunmetal Finish Over Brass Stampings

My Quest For Gunmetal. Part 1 FarmCraft101

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Learn Stainless Steel Coloring Techniques on Balustrade, Railings & Post - By AMbros Custom