What causes this to occur on a coin?

This just looked a bit cool but I donno I feel like its build up or something I should learn about. Thank you for any information!

 

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The exposed zinc core, out because plating was damaged.
Worth one cent

 

Thank you for the info!

 

Just so you know, mid 1982 the mint switched from copper alloy to a zinc metal coated in a thin layer of copper, so you can find all sorts of oddities on cents from 1982 to present. You probably knew that, but thought I'd put it out there. NAV (no added value) on the majority of it.

 

I call them zilincons the perfect name and one of the mints worst things to create.

 

Looks like a fine point green Sharpie marker. Maybe a bored individual?

 

It's called split plating. The die breaks the plating on the planchet on the strike. Technically a mint error, but it's not a valued error and considered an inferior example of a coin to the hobby.

I keep extreme examples if I find them in mint state still but only if the exposed zinc hasn't started to turn to powder yet or discolor significantly from the zinc grey color but I don't know anyone else that does this besides me. There's really no collector interest for them.

 

I call them biodegradable coins. Crafted to not withstand the test of time.