1990 Penny Possible Planchet Issue - Coin Community Forum

To participate in the forum you must log in or register.

Author	Replies: 13 / Views: 1,047
Redbird10 New Member United States 24 Posts	Posted 10/26/2024 8:46 pm I know this 1991 is a mess, but wanted opinions on what would cause such damage. Don't see a mint mark. Report this Post to the Staff

Spence Moderator United States 34398 Posts	Posted 10/26/2024 8:48 pm Not an error but rather the zinc core is rapidly being destroyed by corrosion. This is definitely a spender (while you still can). "If you climb a good tree, you get a push." -----Ghanaian proverb "The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz Report this Post to the Staff
ijn1944 Bedrock of the Community United States 19147 Posts	Posted 10/26/2024 8:56 pm One of the more advanced stages of zinc rot I've seen on a Memorial cent. Excellent example. Report this Post to the Staff
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 10/26/2024 9:00 pm Zinc rot mess. to the CCF! Report this Post to the Staff
Dearborn Moderator United States 95550 Posts	Posted 10/26/2024 9:08 pm wow! what a mess that one is.. 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
Errers and Varietys Bedrock of the Community United States 73987 Posts	Posted 10/26/2024 9:16 pm Zinc rot, PMD. Errers and Varietys. Report this Post to the Staff
Tacc Pillar of the Community United States 3535 Posts	Posted 10/26/2024 9:39 pm Major Zinc Rot of an extreme nature! Report this Post to the Staff
Marv65 Bedrock of the Community United States 10515 Posts	Posted 10/26/2024 10:53 pm May have had some deterioration help from acid or an acidic environment. Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 10/27/2024 04:14 am Redbird10, and John1 Report this Post to the Staff
spru Bedrock of the Community United States 12477 Posts	Posted 10/27/2024 04:35 am I'm surprised it's still holding together at that stage. In Memory of Crazyb0 12-26-1951 to 7-27-2020 In Memory of Tootallious 3-31-1964 to 4-15-2020 In Memory of T-BOP 10-12-1949 to 1-19-2024 Report this Post to the Staff
coin rejector Pillar of the Community United States 2843 Posts	Posted 10/27/2024 12:44 pm That would definitely be a candidate for the .... Give/Take Coin Tray, at the local gas station. Report this Post to the Staff
J-Tal Valued Member United States 114 Posts	Posted 10/27/2024 3:24 pm Zinc is much more reactive than the copper a simple acid soak will not do this.They dissolved the copper first. Someone did somethin a little more involved with this experiment. Something like this https://goldrefiningforum.com/threa...penny.15960/ or this http://sciencewithscreens.blogspot....coating.html Edited by J-Tal 10/27/2024 3:28 pm Report this Post to the Staff
spru Bedrock of the Community United States 12477 Posts	Posted 10/28/2024 03:38 am Quote: Someone did somethin a little more involved with this experiment. I believe you are over-thinking it, J-Tal. This coin most likely had damage in multiple areas (like a parking lot coin) that cause the zinc core to be exposed to air and moisture. Once that happens, as I understand, the copper and zinc work against one another (or together, depending on how you look at it) to cause the deterioration seen here. I don't know the name of the specific reaction that occurs but it probably has something to do with the exchange of electrons. In Memory of Crazyb0 12-26-1951 to 7-27-2020 In Memory of Tootallious 3-31-1964 to 4-15-2020 In Memory of T-BOP 10-12-1949 to 1-19-2024 Edited by spru 10/28/2024 03:39 am Report this Post to the Staff
Maine Member Valued Member United States 450 Posts	Posted 10/28/2024 04:00 am Kind of looks like a science experiment gone wrong. There are many chemicals or substances which would cause damage like this. Certainly zinc rot is the result. Report this Post to the Staff
	Replies: 13 / Views: 1,047

To participate in the forum you must log in or register.

All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins

Silver Gold Bull US is the United States leading bullion dealer. We deliver gold coins, gold bars, silver coins, silver bars and precious metals to your door. Order today!

The First Dollar, your premier source for bullion and rare coins. See our bullion list on the site and the coin inventory on ebay.

View Last 100 New Topics

View Last 100 Active Topics

Disclaimer: While a tremendous amount of effort goes into ensuring the accuracy of the information contained in this site, Coin Community assumes no liability for errors. Copyright 2005 - 2026 Coin Community Family- all rights reserved worldwide. Use of any images or content on this website without prior written permission of Coin Community or the original lender is strictly prohibited.
Contact Us | Advertise Here | Privacy Policy / Terms of Use

Coin Community Forum

It took 0.43 seconds to rattle this change.