What Can Cause A Coins Cladding To Be Missing?

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Author	Replies: 5 / Views: 1,199
sipherL New Member United States 7 Posts	Posted 05/28/2014 2:29 pm I've found three dimes a 1966, 67, and 68. The 66, and 67 appear to be completely missing the clad layers and the 68 is missing all but spots of cladding on the obverse and on the reverse almost all cladding except for the rim, half of the torch and three leaves on the oak branch. Also on the reverse of the 68, the top half of the "of" and all but the bottom tips of "America" and bottom half of "dime" are missing it has the cladding in that area but is completely flat no rim or any sign of the letters. What can cause this to happen? Report this Post to the Staff

biokemist6 Bedrock of the Community United States 12437 Posts	Posted 05/28/2014 4:42 pm Cladding errors are caused by poor bonding of the clad sandwich layers. These errors are not rare but they are certainly not common and finding three would be quite a find indeed. However, many purported cladding errors frequently turn out to be environmental damage as ground exposure can turn CuNi clad a dark brown color. For any missing clad error, weight is the key to determining authenticity. Report this Post to the Staff
bpoc1 Rest in Peace United States 4078 Posts	Posted 05/28/2014 5:21 pm This is a great learning topic for all. Thanks Biokemist6 for the reply. Report this Post to the Staff
sipherL New Member United States 7 Posts	Posted 05/28/2014 8:08 pm If I'm not mistaken an acid can also be used to remove the clad layers but would also cause damage to the coin especially the edge. What could cause the missing letters on the reverse of the 68 dime? I know a filled die can cause that but doesn't seem likely in this case, it should still have a visible rim if that's what it was. Could it have been a tilted die that caused the missing letters and rim? Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 05/28/2014 8:50 pm A coin missing a clad layer will be thin so it will have a weak strike, especially near the rim. Chemical erosion and environmental damage can also affect the strength of the devices but that is separate from a strike issue. I cannot say any more about your coins than that without pictures. Report this Post to the Staff
sipherL New Member United States 7 Posts	Posted 05/28/2014 9:14 pm I believe I can rule out chemical and environmental damage for the missing letters, the cladding that's left on the reverse is still shiny and the color it should be. Where this starts at the end of "states" and the beginning of "dime" it looks like the rim started to widen and continued until it covered almost all of "America". It looks like the die never touched this area. Report this Post to the Staff
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