My understanding of the rust bluing process used on the P.08 is that the chemical used to oxidize the steel was brushed on/applied to the surface; that is, the entire piece was not dipped into the chemical solution. The surfaces that did not receive the oxidizer did not turn blue. Once the rust developed it was carded off and then another round of application, rust, and carding occurred, with each successive round creating a deeper, darker shade.
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