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 Bluing Gone Plum?
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americanboy
Advanced Member


USA
363 Posts

Posted - 02/04/2017 :  12:22:14 PM  Show Profile Send americanboy a Private Message  Reply with Quote
I recently acquired a pretty good looking Iver Johnson, which has a plum slide...purple if you will. When I was in the collecting-Walther phase of my life, one could often find the slides of some German made PPK's that had turned a similar color plum over time. It was attributed to the fact that the slides had been heat-treated and reacted differently to the chemicals used during the bluing process. Iver Johnson slides were cast as I understand it. There are no casting marks on this slide and it's very well finished. Other steel parts on the gun that have been blued retain the dark blue finish, some of which are presumed to be cast and not forged.

Does anyone have any information, ideas or simply a wild guess as to why I may have a purple operating slide?

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TLC954
Greenhorn Member



39 Posts

Posted - 02/04/2017 :  2:04:06 PM  Show Profile Send TLC954 a Private Message  Reply with Quote
americanboy, the plum coloration may be the result of a few different possibilities. First, the coloration is typically not progressive in nature. Whenever steel alloys that are high in either silicon or chromium content are baked in nitrate/nitrite based solutions, the plum coloration results. I won't get into the chemistry involved. Also, contaminated or weak blueing salts can result in the plum coloration regardless of metal chemical content. There is more than ample information on the subject available on the web.

TC
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americanboy
Advanced Member



USA
363 Posts

Posted - 02/04/2017 :  2:23:15 PM  Show Profile Send americanboy a Private Message  Reply with Quote
I called myself searching, but obviously not the right subject matter. My degree says I'm an Electrical Engineer and not a Chemical Engineer....LOL. I have done some electro-plating in my time, but never any commercial bluing. It's just a bit odd to see the deep plum color on the slide and the rest of the gun is practically black, but who knows what they used for base-metal. They did some funny things down there in Arkansas and I've already uncovered a few. I was just curious as to any other sightings of discolored slides on Iver Johnson's.

Thanks for the insight.
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TLC954
Greenhorn Member



39 Posts

Posted - 02/04/2017 :  2:34:21 PM  Show Profile Send TLC954 a Private Message  Reply with Quote
Yah, my degree says the same thing, although I was pretty heavy into the mechanical tool/die and metallurgy side of things prior to fixing super-computers.
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RASelkirk
Junior Member



52 Posts

Posted - 02/04/2017 :  4:11:45 PM  Show Profile Send RASelkirk a Private Message  Reply with Quote
I'd always heard it was a result of bluing over a Parked finish, or Parking over a blued finish. Can't remember which...

Russ
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americanboy
Advanced Member



USA
363 Posts

Posted - 02/04/2017 :  6:46:12 PM  Show Profile Send americanboy a Private Message  Reply with Quote
Maybe I'll just name it the Purple People Eater?
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Tuna
Moderator



3306 Posts

Posted - 02/04/2017 :  7:39:10 PM  Show Profile Send Tuna a Private Message  Reply with Quote
Only if it has one eye, one horn and can fly.
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