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 Replies: 44 / Views: 2,638 |
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New Member
Canada
21 Posts |
 I'm a little bit late to the conversation but here is my take. If you immerse a copper-plated steel penny in an ammonia solution, the copper will dissolve but the steel won't. I've included pictures showing the results. This works much better than an acid bath which could affect the steel as well as the copper. This process doesn't work well with copper-plated zinc pennies though.
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New Member
 Canada
20 Posts |
Oh interesting. How much does it weigh now that that copper plate is off?
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Moderator
 United States
162835 Posts |
Very interesting.  |
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New Member
Canada
21 Posts |
The unplated coin weighs around 2.24g
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Moderator
United States
162835 Posts |
Thank you for adding that.  |
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New Member
Canada
20 Posts |
Ug! this still poses a problem for my coin. If the coin was in some sort of acid dip and still retains the coins maple leaf etc. why does my coin weighs in at 1.80 grams?
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Pillar of the Community
 Canada
5402 Posts |
Are you sure that your weight is correct and the scale accurate. A normal '07 cent is 2.25 grams, not 2.35 that you mentioned early. With the copper gone, it could have weighed .4 grams. What weight do you get with your scale for a normal '07?
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New Member
Canada
21 Posts |
Copper plated zinc has a mass of 2.25g and copper plated steel has a mass of 2.35g.
Your 2007 penny at 18.64mm in diameter is too large in diameter to be from a 1 pesewa planchet which is only 17mm. If the copper plating were removed from a 1 pesewa coin its mass would be less than 1.8g as well. for those reasons, I don't think your coin was accidentally struck on the wrong planchet.
I agree with those who have previously stated that some sort of acid solution was used. There are several reagents that could be used to dissolve steel. Before I was retired, I had access to a lab and could have tried to duplicate your coin. I suspect that diluted solutions at varying temperatures were used so the reaction proceeded slowly which could have possibly preserved the details of the coin.
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New Member
Canada
20 Posts |
I did post an earlier picture that showed the 2007 penny being magnetic, which is 2.35g weight. And I bought new scales and weight to make sure it was accurate. Don't know what to think-ug
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New Member
Canada
20 Posts |
I need to get proper mm on this coin, perhaps the maple leaf design was stamped on a dime planchet before it was cut with little fine dime ridges ? just wild guess
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Bedrock of the Community
United States
18355 Posts |
It's too heavy to have been struck on a dime planchet. All evidence so far indicates that this coin was subjected to acid erosion. Remember, when you hear hoofbeats, think horses - not zebras.
Inordinately fascinated by bits of metal with strange markings and figures
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Moderator
Canada
10436 Posts |
Quote:
I'm a little bit late to the conversation but here is my take. If you immerse a copper-plated steel penny in an ammonia solution, the copper will dissolve but the steel won't. I've included pictures showing the results. This works much better than an acid bath which could affect the steel as well as the copper. Impressive how it appears to have lustre even after the bath. I'd love one of those for teaching purposes, if you ever want to make another one.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: https://creativecommons.org/license...0/deed.en_USMy ebay store
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New Member
Canada
21 Posts |
@SPP-Ottawa
You can easily do one yourself. All you have to do is place a steel plated penny into a solution of household ammonia and let is sit for several days. As the copper dissolves the solution will turn blue because of the copper ions. Its best to do it in a jar with a lid on it.
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New Member
Canada
20 Posts |
Are blanks larger than planchets-weight ect? perhaps the dime blank was put into the penny press or forgot to be removed before the pennies were being struck. Human error kinda thing. After all, this penny is 1.80g, just a thought.
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Replies: 44 / Views: 2,638 |
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Posted 01/05/2025 8:33 pm
