I like to collect silver quarters and from afar, I thought this was one. But turns out it was from 1972. The quality of the quarter is completely diminished (it's a shame)... but when I picked it up, I noticed the edge was... bizarre. Any ideas what this is??? I've researched the internet, but I've come up with no clues. Only thing I've found was something called a "railroad rim" error, but the descriptions and the pictures are not like this at all.
it's not so much the tarnish quality that i'm curious about... it's the edge that interests me. a normal coin is well blended. this looks like an oreo cookie.
But if it was dippied in acid that reacted to the copper more than the nickle copper cladding than a result such as your could be expected.
Definitely acid etched. I've seen many similar coins with the same sort of acid damage, including the recessed copper core.
It fumes and bubbles? Who knows. I've nearly twisted one into a knot using it as a screwdriver. Lost in a washing machine. Run over a 100,000 times on a freeway. The list goes on and on and on and...........as to why and how coins are damaged.
If you soak a clad coin in a weak acid such as vinigar for an extended period of time you will find that it attacks the copper at a faster rate than the coppernickel layers and over time you get that groove around the edge of the coin.
There's a reason for you .....8th grade science fair project. Leave a coin in a bottle of vinegar, cola, water, report changes/differences over x period of time, etc.....
