Quarter damage, Hard to explain what happened to this guy especially on the edge 2 2

[Mr.Bill347]

Wondering how this might have happened? Coin look like it was buried or something but the concave edge puzzled me. It it were ground on the edge it would be flat or rounded but this one is concave.? Thoughts?

[l.cutler]

It's been exposed to some kind of acid, it affects the inner copper core more than the outer copper nickel layers.

 

[EagleRJO]

On 11/12/2022 at 5:10 PM, l.cutler said:

It's been exposed to some kind of acid, it affects the inner copper core more than the outer copper nickel layers.

 

It looks like an OREO cookie. 

[Greenstang]

I.cutler nailed it, have seen this numerous times.
It has had an “acid bath” which will eat the copper core away before the nickel. Weighing it should show that it is lighter.

 

[Hoghead515]

On 11/12/2022 at 5:10 PM, l.cutler said:

It's been exposed to some kind of acid, it affects the inner copper core more than the outer copper nickel layers.

 

That was my first thoughts as soon as I seen it. Before I read the replies. You can see how wavy and pitted it is from the acid. Thats my first time, being a newbie, seeing the core eat out more than the outer layer. Must be softer and react to the acid more. Learned something new today. 

[VKurtB]

On 11/12/2022 at 5:30 PM, Hoghead515 said:

That was my first thoughts as soon as I seen it. Before I read the replies. You can see how wavy and pitted it is from the acid. Thats my first time, being a newbie, seeing the core eat out more than the outer layer. Must be softer and react to the acid more. Learned something new today. 

Most elemental metals (100% copper) are more reactive than most alloys or mixtures. 

[Coinbuf]

On 11/12/2022 at 3:16 PM, EagleRJO said:

It looks like an OREO cookie. 

Not so tasty tho.  

[EagleRJO]

On 11/12/2022 at 5:10 PM, l.cutler said:

It's been exposed to some kind of acid, it affects the inner copper core more than the outer copper nickel layers.

 

Yea, makes sense to me also. If it was submerged in an acid it would cause some erosion/damage to the outer layer, but more erosion/damage to the core. Prolly a HS or CH101 chemistry "experiment". 

[Ray Tatum]

I like to keep some around for that stuck-on goo.

[Hoghead515]

On 11/12/2022 at 7:48 PM, Ray Tatum said:

I like to keep some around for that stuck-on goo.

I like that bottle. Pretty neat.