Crazy, Deep azure blue PSD on this 2007 Lincoln cent

[Petespockets55]

I saw the reverse first and noticed a little bit of corrosion on the rim. When I flipped it I was really surprised by how deep the colors are. The colors are so crazy I had to post it. Some type of caustic substance creating these colors. I'm guessing it's reacting with the copper plating.

[makecents]

That's crazy looking Cliff!! I immediately thought of these when I saw it.

(https://en.wikipedia.org/wiki/Algal_bloom)

[VAB2013]

Wow Cliff... that's some crazy looking blue! Maybe it came out of Lake Erie? (cool link Jon)

[Petespockets55]

That's crazy looking Cliff!! I immediately thought of these when I saw it.

(https://en.wikipedia.org/wiki/Algal_bloom)

Or this in Belize.

Blue Hole LINK .

[GrumpyEd]

I think it grew copper sulfide Cu2S:

Link

[WaterSport]

Looks like a science project that went terribly wrong!

WS

[jfines69]

To me it looks like some one was playing with silver nitrate to see the reaction with copper... Here is a little info https://www.reagent.co.uk/what-happe...ilver-nitrate/