Trapped Burnishing Ball ? - 1776-1976 Bicentennial Quarter

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Author	Replies: 6 / Views: 3,508
NaNa_9 New Member United States 13 Posts	Posted 04/02/2022 3:47 pm When I first found this quarter about a year ago and saw the lump on Washington's face I thought someone used a punch on it but when I turned it over the reverse also had a lump and not an indent. I have searched for months trying to find out what would have cause this damage. In my opinion it had to come from inside the coin since there was a lump pushing out on both sides. Then today something I had never heard of popped up in my search...Trapped Burnishing Ball". I finally found something that's an "explosion" inside a coin BUT could it cause this? The last 2 pictures are just showing that its raised and not indented on both sides. If not TBB then what could have caused this? Thank you. Report this Post to the Staff

SaturnD51 Valued Member United States 425 Posts	Posted 04/02/2022 4:40 pm Quote: Gas Bubbles PART V. Planchet Errors: Alloy Errors: Gas Bubbles Definition: On rare occasions a pocket of gas forms and expands when a planchet is struck. The heat generated by the strike is deemed responsible for the gas expansion. The expanding gas pushes up the overlying metal, producing a rounded bulge with soft borders. If the roof remains intact, the error is designated an "occluded gas bubble". If the roof explodes from the internal pressure, we call it a "ruptured gas bubble". If the roof is thin, it will flex or it will be left with a dimple when the tip of a toothpick is pressed into it. If the roof is thick, it may not yield to pressure. By definition, occluded gas bubbles are generally restricted to solid-alloy issues. While gas bubbles are sometimes seen on clad coins, these always turn out to have been caused by heat applied externally outside the Mint. Occluded gas bubbles should not be confused with blistered plating, the latter being an affliction restricted to copper-plated zinc cents. Source: https://www.error-ref.com/gas-bubbles/ Might be a gas bubble which ruptured when struck. That's all I could find. Report this Post to the Staff
nick10 Pillar of the Community United States 3207 Posts	Posted 04/02/2022 4:50 pm coins in campfire can end up looking like that Report this Post to the Staff
Spence Moderator United States 34428 Posts	Posted 04/02/2022 6:08 pm With those molten bits of some other metal now solidified on the coin's surface, my vote is also for a campfire coin—damage not a mint error. @saturn, thx for providing that information, although it looks like you have cut and paste it from the error-rev website. Best practice is to make this clear by providing your source and putting the text in quotes. I'll do that for you now, but please let me know if I'm wrong and you wrote that up on your own. Thx. "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
Coinfrog Bedrock of the Community United States 94367 Posts	Posted 04/02/2022 7:12 pm to the CCF! Report this Post to the Staff
Earle42 Bedrock of the Community United States 10044 Posts	Posted 04/02/2022 8:28 pm Campfire is my opinion as well. How much squash could a Sasquatch squash if a Sasquatch would squash squash? Download and read: Grading the graders Costly TPG ineptitude and No FG Kennedy halves https://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2 Report this Post to the Staff
SaturnD51 Valued Member United States 425 Posts	Posted 04/02/2022 11:04 pm Thanks Spence for helping me. Everyone has been helping me along on this board. Great to know people care,thanks again. Report this Post to the Staff
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