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I do NOT recommend hot tank blue as a DIY project, and certainly not for one or a few guns. The cost has already been mentioned, but also it is VERY DANGEROUS. You are fooling with caustic salts at a high temperature. One splash can burn through to the bone before you can even think about it. You need protective gear like a heavy rubber apron and boots, goggles, gloves, a heavy cap and face shield. And a lab type douse shower that will dump gallons of water in seconds. And a place for that water to go.
Hot tank bluing in your kitchen? Some people claim they do it and it is easy. I hate to call folks liars, but they are certainly either misleading others or taking great risks with their own safety (or they literally don't know what they are talking about).
Jim
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