Sorry, no expert on this, but I know a bit. Strawing is actually a heat treatment finish, not a chemical reaction such as bluing.
I know that it "fades" over time, it is unknown by me if the fading is due to air exposure or sunlight, time is a factor, but if a gun is kept in a controlled environment, then it doesn't lose its strawing as fast.
Thor or others?
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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