I tried "Classic Rust Blue" agent from Brownells and reblued a P-1 magazine (for fun). I followed the instruction and it worked. There are only two problems in the end result: maybe I repeated the process too many times (5 times), the 'blue' generated really appeared to be black, and did not show those old gun's grey-blue blended color under light. Another problem I found... I did slight sanding before bluing, the the "Walther" banner became blurred in the end result.
Some fun though.
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