Here is Larry Potterfield of Midway USA doing slow rust bluing, first with a rod and then a later video using plugs and introducing the use of warm moist air cupboard.
He uses a proprietary rust bluing solution.
This guy uses a homemade solution and a heat gun. I presume the heat gun is to heat the steel prior to applying the solution to accelerate the reaction but the video does not show use of the heat gun -- maybe he decided it was not necessary.
Recipe for the rust bluing solution used: 1 cup hydrogen peroxide, 1/4 cup distilled white vinegar, 1/16 cup salt.
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