Use ‘Gun Blue’ to Instantly Blacken Hardware

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I use blacksmith-made hardware whenever I (or my customers) can afford it. But if you’re on a budget or have hundreds of pieces of hardware for a project, it’s time to visit the gun store. My favorite way to blacken steel, iron or even zinc-plated hardware is to brush on a thin coat of liquid “gun blue” – typically a combination of selenious acid, nitric acid and cupric sulfate. If […]

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