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Offline CyberborikuaTopic starter
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« on: April 23, 2011, 09:28:16 am »
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Ok, I recently found two buffalo nickels in a pocket spill with three other wheat pennies. They were all stuck together with a heavy, green, possibly copper oxide, coat. Now, because I could not remove the heavy green coat on the 1927 nickel with electrolysis, I tried tumbling it out with other dug nickels. To my surprise, the buffalo nickel came out with a brilliant copper tone (like a new penny). I first thought that I ruined the coin with the electrolysis, but I doubt that the stainless steel spoon that I used as the anode could cause a copper electroplating on the nickel. There is then the possibility that the coin lost its nickel coat due to corrosion. However, I also found that a number of buffalo nickels were struck on cent planchets. Only some 65 have been traced, and two of those carried the 1927 date (see:

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http://www.davidlawrence.com/inventory/viewitem.cfm/inventory/313847/inm/Mint-Error%3A-1927-5c-PCGS-MS60-BN-(Struck-on-Cent-Planchet)/snm/Buffalo-Nickels/gnm/Nickels
). My question is, what is the chance that the coin lost its nickel coat to corrosion versus it being struck on a cent planchet?

I also know that by tumbling the coins, they lost collector value, but it does not matter much to me because I have no plans on selling them, and eventually, exposure to the air will bring back the old copper patina look.

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Offline GoldDigger1950
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« Reply #1 on: April 23, 2011, 09:33:52 am »
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If struck on a cent planchet, it would be the same size as a cent, or one would assume so. See how it compares in size.

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Offline CyberborikuaTopic starter
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« Reply #2 on: April 23, 2011, 09:42:36 am »
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Quote:Posted by GoldDigger1950
If struck on a cent planchet, it would be the same size as a cent, or one would assume so. See how it compares in size.


Well, the specimens shown on the link have the same size of a regular nickel.

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« Reply #3 on: April 23, 2011, 09:48:36 am »
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For whats its worth... I have tryed cleaning newer nickels, dimes and quarters  in lemon  juice and they all come out pinkish?

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Offline CyberborikuaTopic starter
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« Reply #4 on: April 23, 2011, 10:16:31 am »
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Quote:Posted by cache
For whats its worth... I have tryed cleaning newer nickels, dimes and quarters  in lemon  juice and they all come out pinkish?


I tell you what. The best way to clean clad coins and nickels is by tumbling them. The pinkish tone is a false patina that can be removed in a tumbler. I have cleaned hundreds of clad coins and the original plating always comes back to life. In the case of the Buffalo, the lost of the nickel coat due to corrosion is a possibility, but given that some seemed to have been struck on a copper planchet need consideration as well.

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« Reply #5 on: April 23, 2011, 11:25:53 am »
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from any where this coin and any era?


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Offline GoldDigger1950
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« Reply #6 on: April 23, 2011, 03:15:54 pm »
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Quote:Posted by Cyberborikua
Well, the specimens shown on the link have the same size of a regular nickel.

Their assumption defies logic. A penny is thinner and smaller than a nickel. I question their legitimacy. I do hope you have a genuine rarity there but I just can't wrap my head around the notion that a thinner, smaller coin in copper would actually pass as a genuine nickel. The design wouldn't even go to the edge.

I'm sure you know what I mean. It's puzzling.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #7 on: April 23, 2011, 07:48:11 pm »
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Quote:Posted by GoldDigger1950
I'm sure you know what I mean. It's puzzling.


I agree it's puzzling. I thought the same thing, but maybe what it is is that it was struck on a copper planchet like those used for pennies. I put the nickel back in the tumbler for I saw some nickel color as the pebbles are removing the green coat.

GD can you throw some light over the possibility of the coin losing the nickel coat to corrosion or if I made a mistake in trying to remove the green coat with electrolysis. Like I said, the anode used was an ordinary stainless steel spoon. The only copper touching the coin was the negative wire. Is it possible that copper cations went into the solution and attached to the coin causing electroplating?

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Offline GoldDigger1950
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« Reply #8 on: April 23, 2011, 08:00:38 pm »
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Coins prior to 1964 were all solid metal, not coated or plated. In 1965, after the silver standard died, clad coins of copper sandwiched between nickel started being minted. Hence the name "clad" coins. The copper was clad with nickel or cupronickel (a copper/nickel alloy).

My guess? You might just have a stray copper coin still inside of your tumbler grit hiding from you. It only takes one to turn the nickels pink.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!
Offline CyberborikuaTopic starter
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« Reply #9 on: April 23, 2011, 09:35:20 pm »
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Quote:Posted by GoldDigger1950
Coins prior to 1964 were all solid metal, not coated or plated. In 1965, after the silver standard died, clad coins of copper sandwiched between nickel started being minted. Hence the name "clad" coins. The copper was clad with nickel or cupronickel (a copper/nickel alloy).

I found that a Buffalo nickel is 75% copper and 25% nickel as described at:

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http://buffalonickel.us/buffalo-nickel-specifications/.
But I see what you say. The nickel composition would not go away with corrosion because is was not electroplated on the coin.

I only put nickels in the tumbler, no other coin came out copper-toned. In fact there is another Buffalo (1937) in the tumbler and is coming out nickel colored as expected. Let see what happens when the tumbling process ends.

My guess? You might just have a stray copper coin still inside of your tumbler grit hiding from you. It only takes one to turn the nickels pink.



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