New 25 pence , 1981 (Diana & Charles)

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JFKunst
Joined: 2 Jun 2016
Posts: 3
Posted: 24 Feb 2021, 12:20 #
Posted: #
Hi All,

My first forum post.

Does any of you know how to distinguish the copper nickel version;

https://en.numista.com/catalogue/pieces3076.html

From the silver version;

https://en.numista.com/catalogue/pieces38852.html

Perhaps i have not checked the descriptions thoroughly enough, but i have not been able to find a definite distinction.

Many thanks!

JF
bjherbison
Joined: 28 Jul 2017
Posts: 2242
Posted: 24 Feb 2021, 14:20 #
Posted: #
Some tests to check the metal.

https://www.youtube.com/watch?v=leZ_TwAPlqk
https://en.numista.com/forum/topic4060.html
https://en.numista.com/numisdoc/determining-the-metal-of-a-coin-27.html
JFKunst
Joined: 2 Jun 2016
Posts: 3
Posted: 24 Feb 2021, 14:21 #
Posted: #
Hi @bjherbison,

Many thanks! Saw this was actually my second post. Getting old i guess.

Cheers!

JF
smvdbrink
Joined: 14 Jul 2017
Posts: 904
Posted: 24 Feb 2021, 15:31 #
Posted: #
Also, it appears that there is a difference is thickness. The Cu-Ni variant is 3.2mm, while the Ag variant is 2.89mm.
They say "Pecunia non olet", but I know better...
Topic moved to "Numismatic questions" (ZacUK, 24 Feb 2021, 20:31)
Essor Prof Catalogue referee
Joined: 13 Apr 2015
Posts: 4731
Posted: 25 Feb 2021, 13:49 #
Posted: #
Here's another forum topic about this, look at the picture at the last post: https://en.numista.com/forum/topic61042.html
rsirian1
Joined: 20 Nov 2020
Posts: 12909
Posted: 25 Feb 2021, 14:58 #
Posted: #
Quote: "Essor Prof"​Here's another forum topic about this, look at the picture at the last post: https://en.numista.com/forum/topic61042.html
​Tissue test sounds interesting. Would you give a description of how to do this?
Idolenz Catalogue referee
Joined: 13 Jul 2013
Posts: 9567
Posted: 25 Feb 2021, 15:05 #
Posted: #
You put one ply of a toilet paper on a coin when it is still bright the albedo of the material is most likely that of silver. Copper-nickel coins would look dark in comparison (it's best to do one side-by-side with coins of known material as a reference).
rsirian1
Joined: 20 Nov 2020
Posts: 12909
Posted: 25 Feb 2021, 15:08 #
Posted: #
Idolenz - Thank you! I'm going to go try this now.
Essor Prof Catalogue referee
Joined: 13 Apr 2015
Posts: 4731
Posted: 25 Feb 2021, 15:13 #
Posted: #
Quote: "rsirian1"​​​Tissue test sounds interesting. Would you give a description of how to do this?
​What I've used in the picture is a sheet of kitchen paper, I've never used toilet paper but the effect will probably be the same. As you can also see on that picture, I did the same thing Idolenz suggested, namely putting a silver coin and a copper-nickel coin at the same time so you can compare the difference.
rsirian1
Joined: 20 Nov 2020
Posts: 12909
Posted: 25 Feb 2021, 15:26 #
Posted: #
Essor Prof - Thank you! First time I've heard of this test. I fully understand the need to have 2 known reference coins.
Essor Prof Catalogue referee
Joined: 13 Apr 2015
Posts: 4731
Posted: 25 Feb 2021, 17:01 #
Posted: #
Don't forget, this is a quick test to make the distinction between a copper-nickel coin and a silver coin if you can assume they are genuine. It's NOT a test to see if a coin is genuine. With the tissue test a silver plated coin for instance will have the same result as a silver coin.
rsirian1
Joined: 20 Nov 2020
Posts: 12909
Posted: 25 Feb 2021, 17:05 #
Posted: #
Quote: "Essor Prof"​Don't forget, this is a quick test to make the distinction between a copper-nickel coin and a silver coin if you can assume they are genuine. It's NOT a test to see if a coin is genuine. With the tissue test a silver plated coin for instance will have the same result as a silver coin.
​Understood. Just did my own test. Worked like a charm! Learn something new every day! Sorry if I've hijacked this thread. :love:

Essor Prof Catalogue referee
Joined: 13 Apr 2015
Posts: 4731
Posted: 25 Feb 2021, 17:14 #
Posted: #
Quote: "rsirian1"​Learn something new every day! Sorry if I've hijacked this thread.

​You didn't hijacked this thread. The initial question was how to distinguish the copper nickel version from the silver version. We didn't talk about something else than that.

Sometimes it is indeed difficult to see whether it is a copper-nickel coin or a silver coin, especially when they are proof coins.
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