Metal bluing coins

[thurmownator]

In a box a halves I went through today were about thirty (30) NIFC halves that looked as they had been metal blued.

http://en.wikipedia.org/wiki/Bluing_(steel)

They still retained their shimmer, but each had varying degrees of blue to almost a purple patina. In fact the darker ones, piled on a table almost looked like those "blue" tortilla chips.

If I didn't know any better I'd say our resident metallurgist and former frequent forum poster jewelerdave may have had a hand in this. 8)

I'll keep them for a while, until I find out more about them.

 

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[namster]

Bluing is applied to steel, I dont think you can blue nickel.

 

[silvernd]

Did it look anything like these - http://forum.treasurenet.com/index.php/topic,453081.0.html

 

[SFBayArea]

If you heat up clad on a stove top, they will turn blue. I've done it a few times and thought ok neat. It's not the same as the look from silver toning though. Many have tried to rainbow tone silver for profits, but it's very difficult to do in a short amount of time. Believe me, I've tried it before.

 

[FreedomUIC]

Water and moisture will do the same thing to a Nickel. Have many many proof sets where the Nickel is Blue and the rest of the Silver Mint set looks just like it came from the mint in 1962.

 

[thurmownator]

Did it look anything like these - http://forum.treasurenet.com/index.php/topic,453081.0.html

Yes, some do look like that. Thoughts ?