True bluing is a conversion process.
Lugers were blued using the Rust Bluing technique through the first quarter of 1937.
Many characteristics of Lugers that help prove authenticity are related to the bluing technique used.
Most "flaking" problems can be traced to improper surface preparation prior to bluing the metal.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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