Black Streaks On Surfaces - Coin Community Forum

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Author	Replies: 5 / Views: 1,500
johnny676767 Pillar of the Community United States 521 Posts	Posted 10/23/2013 12:44 am Hello, I have noticed black streaks on some coins. Is this some residue from cleaning or marks from something contacting the coin? I see it mostly on classic coins but I saw it on a Lincoln Cent I got in change the other day. Here's a pic of what I mean. This example is more pronounced than some. http://www.ebay.com/itm/19093778988....m1438.l2649 Edited by johnny676767 10/23/2013 01:17 am Report this Post to the Staff

FadeToBlack Pillar of the Community 1751 Posts	Posted 10/23/2013 01:01 am I think the steaks are charred. The streaks typically come from rubber bands. :) Report this Post to the Staff
westcoin Pillar of the Community United States 9792 Posts	Posted 10/23/2013 04:18 am usually from rubber bands is my experience as well. "Buy the Book Before You Buy the Coin" - Aaron R. Feldman - "And read it" - Me 2013! ANA Life Member #3288 in good standing since 1981, ANS, Early American Coppers Member (EAC), Colonial Coin Collectors Club member (C4), Conder Token Collector Club member (CTCC), Civil War Token Society (CWTS) member, Liberty Seated Collectors Club (LSCC) & Numismatic Bibliomania Society member (NBS), USMex, Member in good standing, 2¢ variety collector. See my want page: http://goccf.com/t/140440 Report this Post to the Staff
g048406 Pillar of the Community 861 Posts	Posted 10/23/2013 08:07 am The streaks, as in the coin pictured below, are from a impure mixture of copper: However, in the bust half in your picture, fadetoblack is most likely correct. Those black streaks are very likely from rubber bands. Report this Post to the Staff
johnny676767 Pillar of the Community United States 521 Posts	Posted 10/23/2013 09:58 am Thanks, the marks actually look like rubber bands. Is this something that is considered environmental damage, which I think means a chemical change in the coin's surface composition? Or, is it something similar to dirt/tape adhesive, which can be removed without damaging the actual coin itself? Report this Post to the Staff
Conder101 Bedrock of the Community United States 17884 Posts	Posted 10/23/2013 10:12 am Rubber band marks tend to be deep toning and can't be removed without stripping the coin via a chemical dip. Report this Post to the Staff
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