1993 Lincoln Cent - I Am Kinda Curious What Does This

From this website I ran into a few descriptions when I was looking at a quarter that had two acid spots yesterday. https://www.coinworld.com/news/us-c...es-vary.html


5. Plating blisters

Plating blisters develop in the coin in the immediate aftermath of the strike, as gas expands between the core and poorly bonded plating. Among domestic coins, plating blisters are the exclusive province of copper-plated zinc cents. Blisters are generally small and subcircular, with a smooth surface and soft outline. They can occur anywhere on the field and design. The design continues uninterrupted as it crosses a blister.


6. Occluded gas bubbles

Solely the province of solid-alloy coins, occluded gas bubbles form just beneath the surface and push up the overlying metal immediately after the strike. Like plating blisters, the surface is smooth and the edges soft. The design is uninterrupted.


7. Corrosion domes

Contaminants trapped beneath or penetrating the surface of alum­inum, plated zinc, and plated steel coins can react with surrounding metal to form an expanding front of spongy, corroded metal. The resulting solid dome will superficially resemble a hollow plating blister or occluded gas bubble. In many cases the corroded metal bursts through and may fall out, leaving a crater.

yep, silver labeled what we simply call 'zinc rot'

I have like a bunch of them this one is the worst one they vary.. I thought they looked like warts lol kinda cool though!

the bubbles you see are from a heat. The zinc was at least 300 deg, Celsius and begone to melt.