Has There Been A Change In Metal Composition?

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Author	Replies: 3 / Views: 2,036
gxseries Pillar of the Community Australia 3831 Posts	Posted 07/28/2016 01:16 am From time to time, I do find nice aUNC nickel copper coins struck in between 1960s to 1980s. They seem to be quite different from 1990s onward. The best way I can describe it is that the earlier coins seem to be more greyish compared to the newer coins which seem to have a sharper brilliant finish. The mint website specifics that they have been struck with 75% copper and 25% nickel. I cannot help wondering - has there been some changes to the alloy or manufacturing process? My partial coin collection http://www.omnicoin.com/collection/gxseries My numismatics articles and collection: http://www.gxseries.com/numis/numis_index.htm Regularly updated at least once a month. Report this Post to the Staff

Sap Moderator Australia 16826 Posts	Posted 07/28/2016 04:24 am The cupronickel alloy is unchanged. The manufacturing process has probably changed, in terms of die preparation, which will probably go a long way to=wards explaining any visible differences in circulation coinage appearance. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis Report this Post to the Staff
Basil Pillar of the Community Australia 1040 Posts	Posted 07/28/2016 07:55 am Quote: I cannot help wondering - has there been some changes to the alloy or manufacturing process? I read a few years ago the metal is cured/treated differently to previous years to maintain a stronger/brighter finish. Report this Post to the Staff
Nevol Formerly nancyc Australia 5385 Posts	Posted 07/28/2016 6:32 pm I noticed quite some years ago, before I quit noodling, that some coins did appear to hold their condition better and I put it down to a couple factors: 1. Coins were minted elsewhere, eg Canada or RM 2. Possibility of the blanks used in other countries' mints being slightly different to the Aussie blanks. 1981 coins were the ones I can remember that stood out the most. life is a mystery to be lived not a problem to be solved Report this Post to the Staff
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