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Bob,
I think it is the bluing salts that's used, or a combination of that and the weld metal. I use Brownell's Oxynate #7, but I also have it mixed with Oxynate S. I have never had any problems with using rod, like 6013, and I'm not sure what that 0.030 wire is, but both come out as black as the surrounding steel. I did have problems with color mis-match, and purple cast on single shot frames, etc., years ago, until I added Oxynate S, and that went away. I don't know what Oxynate 84 would do, or another brand, as I've never tried it. Also, I leave everything in the tank for at least 30 minutes, where most everyone says 15.
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