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1984 Off Coloured Ten Cent

 
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Pillar of the Community

Canada
767 Posts
 Posted 03/02/2017  10:43 am Show Profile   Bookmark this topic Add Hounddog Bill to your friends list Get a Link to this Message
Forgive for the poor quality of the pictures I sure haven't mastered the art of photographing these reflective coins.
I have another off colour coin this time a 1984 ten cent.
I'm having trouble getting a photo to show the lustre and colour properly but it has cartwheel lustre under the toning and the colour is steel grey with a hint of blue throughout.
The weight is 2.2 grams and it's magnetic.
Is it heat that turns a coin made of nickel to this "lustrous" grey blue colour?

Cheers, Bill

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Canada
8924 Posts
 Posted 03/02/2017  12:26 pm  Show Profile   Check SPP-Ottawa's eBay Listings Bookmark this reply Add SPP-Ottawa to your friends list Get a Link to this Reply
Nickel can tone with heat, but rarely is the colour so uniformly consistent... if it is just toning, it is beautiful...

Of interest, Mike had me test a beautiful, gun-metal blueish 1949 5-cent once, and it was (relatively) enriched in cobalt, which is common as an accessory element in nickel ore, but usually smelted out. Mike's coin contained 1.5% cobalt, which means the RCM received a crappy batch of nickel ingots or strips.

I can always test that one for you Bill, as well...
"Research is what I am doing, when I don't know what I am doing" --Wernher von Braun

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