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The most important thing in any bluing process is the metal prep IMO.
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This. It's all in the preparation. You can express blue it but this process will take several days. After polishing and degreasing, you apply the rusting solution and let it hand in a sweat cabinet (box/pvc with a can of water and a light bulb) for a day. Remove it and card it off, degrease, apply another coat of rust solution and back into the box. Repeat until desired blued is attained.