Explanation For Toning? 1995 Chinese Bi-Metallic 25元

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Author	Replies: 6 / Views: 2,070
newguy22 Valued Member United States 277 Posts	Posted 03/25/2021 6:54 pm We all know that silver commonly tones under certain conditions, but gold not so much. Quite frankly, I don't think I've ever seen gold tone quite like this, except for maybe this 1857-S double eagle from the SS Central America: https://www.greysheet.com/news/stor...-philly-show Would any of you have an explanation for why the gold on this coin toned the way it did? Report this Post to the Staff

Coinfrog Bedrock of the Community United States 94367 Posts	Posted 03/25/2021 7:17 pm Sure looks artificial to me. Report this Post to the Staff
sel_69l Bedrock of the Community Australia 21786 Posts	Posted 03/25/2021 7:42 pm It is a technical / chemistry problem that the Chinese Mint will have of sort out quickly. I have lots of very nice Chinese friends. It is a common mentality with new collector items, such a new mint product seen here, that it is perfect and will always remain that way. Other Mints around the World have already successfully produced bimetallic gold/silver collector coins. ---------------------------------------------------------------------------------------------------------------------------------------------------- Unless it is a very good fake ? That's a problem the Chinese Government will have to sort out in an effort to get rid of the large volume of fake products of all sorts that are produced in China. It is increasingly damaging their international business reputation. Report this Post to the Staff
jecz79 Pillar of the Community Portugal 655 Posts	Posted 03/16/2025 5:09 pm I do not think the metal or mint can be blamed for that toning. In my experience when there are impurities that cause spots they appear on every coin of the series. This was a small series, surely all 2000 were done in the same mint? There are coins of this series that are fine today. I do not have a photo now but can produce one some day. I liked these for being bimetallic. Do not know if others did bimetallic gold and silver first but they were among the first. The capsule these coins came in was weak. And I once saw one sold as bullion, no box or even capsule. That one must just have suffered environmental damage. Report this Post to the Staff
gxseries Pillar of the Community Australia 3831 Posts	Posted 03/16/2025 6:51 pm It's a bit of a pity as these bimetal coins are struck with very low mintage. Definitely poor environment storage or treated with chemical. 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
Albert Pillar of the Community United States 1912 Posts	Posted 03/16/2025 8:15 pm My first thought was artificial- kitchen chemistry- maybe in an oven? There are some petroleum distillates that can react with a similar result. Report this Post to the Staff
Dearborn Moderator United States 95018 Posts	Posted 03/17/2025 08:56 am it looks artificial toning, Collecting since 1972. Learning from then on "Tell me and I forget. Teach me and I remember. Involve me and I learn." - Benjamin Franklin 7070 type set coin count: 51/76 Uncirculated American Silver Eagles My American Silver Eagle Proof Collection Sacagawea Dollars Innovation Dollars Eisenhower-Dollars Kennedy-Half Dollars Washington-Quarters Roosevelt-Dimes Buffalo-Nickels 1938-2005 Jefferson-Nickels Lincoln-Cents Report this Post to the Staff
	Replies: 6 / Views: 2,070

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