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Rust blue vs DuLite
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Location: 32000' +
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April 9, 2017 - 5:10 pm
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I am currently trying to date some small Winchester components where the only change from old to new was the type of finish. 

Is there a non-destructive forensic method to tell the difference between the rust bluing method and Du-Lite blue?  On polished surfaces I can easily see the difference under a strong light but on matte finishes (such as those small parts Winchester tumbled in a Panghorn) I have a more difficult time.

Hoping there is something like a lighting frequency or chemical trick that can easily separate them.

Thanks!

WACA Life Member #6284 - Specializing in Pre-64 Winchester .22 Rimfire

http://rimfirepublications.com/  

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April 10, 2017 - 12:16 am
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Okay, after some deep Googling it looks like it can be done with X-ray diffraction since the wavelength spectrum of Du-Lite black oxide

(magnetite) is in the 535-662cm-1 range which differs from traditional rust bluing.

I was hoping for an easier/cheaper method……….

WACA Life Member #6284 - Specializing in Pre-64 Winchester .22 Rimfire

http://rimfirepublications.com/  

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