Josephcoin2873 Posted Tuesday at 04:41 AM Share Posted Tuesday at 04:41 AM I was looking through my grandparents coins and found this odd quarter. It seems to be made out of copper, but I am not sure. It feels different than a normal quarter, and seems lighter. I don't have a precision scale to verify this though. If anyone could tell me if this could have value, or if it is just something that is visually interesting, it would be much appreciated! Link to comment Share on other sites More sharing options...
JKK Posted Tuesday at 05:21 AM Share Posted Tuesday at 05:21 AM Looks corroded through the cladding, probably ground damage. Worth $0.25. powermad5000 1 Link to comment Share on other sites More sharing options...
Josephcoin2873 Posted Tuesday at 05:29 AM Author Share Posted Tuesday at 05:29 AM On 6/25/2024 at 12:21 AM, JKK said: Looks corroded through the cladding, probably ground damage. Worth $0.25. Alright, thanks for the info! Link to comment Share on other sites More sharing options...
Coinbuf Posted Tuesday at 02:15 PM Share Posted Tuesday at 02:15 PM Missing clad layer coins are true errors, however your coin looks more like corrosion. A weight would be helpful as coins missing the clad layer are much lighter. I'd suggest soaking it in acetone to see if the gunk can be removed and then an accurate weight. Crawtomatic 1 Link to comment Share on other sites More sharing options...
Henri Charriere Posted Tuesday at 02:46 PM Share Posted Tuesday at 02:46 PM (edited) Oh for Chris'sake, do NOT prep this coin for reintroduction to circulation!... Bad enough it is a clad. Give it a decent burial. I will reimburse you for the twenty-cents (sheesh!) and all expenses. Edited Tuesday at 02:47 PM by Henri Charriere Add emoji. JKK and Mike Meenderink 1 1 Link to comment Share on other sites More sharing options...
Popular Post Sandon Posted Tuesday at 03:19 PM Popular Post Share Posted Tuesday at 03:19 PM The outer layers of clad quarters (1965 to date) are composed of an alloy of 75% copper, 25% nickel. This alloy may darken through corrosion to a reddish or black color when the coin is buried in damp ground. The black, raised encrustations on the coin are indicative that the coin is corroded and not a mint error. powermad5000, Mike Meenderink and Henri Charriere 3 Link to comment Share on other sites More sharing options...
Mike Meenderink Posted Tuesday at 09:02 PM Share Posted Tuesday at 09:02 PM (edited) So, I'll just add one thing. This is what happens to a Cupronickel coin when it is exposed to an electrolyte (wet soil) and the two metals copper and nickel (as well as small amounts of Iron and Manganese) galvanically react to each other in which the copper and iron always win. This produces the corrosion products seen including Cupric Sulfide Cu2S (black stuff) Iron oxide Fe2O3 (red stuff) Malachite [Cu2(OH)2CO3] (green stuff). The nickel is pretty much gone and has been "leeched" out by electrolysis and galvanic corrosion. The yellow substance is the "leeched" manganese it does not corrode and while usually black the galvanic process changes its structure and color as it is left as a surface layer deposit of the galvanic reaction. Edited Tuesday at 09:12 PM by Mike Meenderink powermad5000 1 Link to comment Share on other sites More sharing options...
