1982 Lincoln Cent W/ Surface Issues

What causes these bubbles?

Here's one explanation: http://www.lincolncentsonline.com/m...laneous.html


You can find a lot of posts/threads about it on this site if you do a search for gas bubbles or zinc zits.

Thanks. I'll check it out. Does anyone else save 1982's? Aren't they supposed to have more copper or something?

Here is a paragraph from a paper I am working on about that:
The composition of the Lincoln
Cent (except for 1943 when the
cent was zinc coated steel) up to
1962 was 95% copper and 5% tin
and zinc. In 1962 the cent's tin
content, which was quite small,
was removed. This alloy of 95%
copper, and 5% zinc remained
until 1982 when the composition
was changed to what is commonly
called copper plated zinc. Cents of
both compositions appeared in
1982. This alloy from 1982 to the
present is actually Zinc Alloy 190
electroplated with 8 microns of
copper. (Concurrent Technologies
Corporation, Page 1, Section 1.1)
ALLOY 190: COMPOSITION (%by Weight) Lead = 0.005 max;
Iron = 0.010 max; Cadmium =
0.005 max; Copper = 0.7 to 0.9;
Zinc = Balance. (Jarden Zinc,
8/12/2015)

Interesting Pete. Writing for school or? Thanks coppercastle, I don't have one but guess I need one.

I heard that the orange rind issue was from a poor rinse technique they used then.

Thank you.