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Old December 3, 2012, 02:58 PM   #3
Senior Member
Join Date: July 15, 2006
Location: Fern Creek ,KY and Metro Louisville at large
Posts: 425
Well cold blue is a chemical reaction between copper sulfate and the acid in the bluing solution.
The copper sticks to the medal and the acid blackens it.
Any DIY solutions are formulas for rust bluing not a cold blue.

As for application of cold blue I use swabs or clean patches/rags/paper towels depending on the area being covered.
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