What Causes Lincoln to break out?

ajia

ahooka454

that smallpox is a nightmare. i have a few 2000+ dated cents thats are like this aswell. very weird and interesting to look at.

ajia

<<very weird and interesting to look at. >>

Absolutely.
Is this contaminants in the base metal?

notwilight

I would say it is almost certainly contamination or improperly washed surface on the zinc causing zinc oxide or some similar compound to form under the copper. the copper appears to be unimpaired. --Jerry

ArizonaJack

I think that was Ron Jeremy's pocket piece...I would toss it if I were you

ahooka454

i agree, the copper looks ok in relation to what is going on underneath. id like to know scientifically what is going on. is this an issue on anyother coins?

I would think its either the wash the planchets get(rinse) or something in the alloy its self.

notwilight

If anyone wants to come up with a few hundred dollars I have a metalurgist who can tell us what it is but I don't think it's worth the lab time right now. --Jerry

tightbudget

Improper plating...usually seen on earlier date zinc cents. Finding one this severe on a 21st century cent is quite rare.

ahooka454

really?
do they carry a premium?

I may have another use for a metalurgist in the not so distant future.

droopyd

<< <i>do they carry a premium? >>



if they do then the whole world's gone ga-ga-goo-goo.

ajia

Strongly doubt they carry a premium.
I've seen quite a few, this one seems the worst so I thought I'd ask about the reason.

Does Jerry have the best explaination? <<contamination or improperly washed surface on the zinc.....>>

hockeyfan9

<< <i>I think that was Ron Jeremy's pocket piece...I would toss it if I were you >>

Broadstruck

ArizonaJack

Shamika

If you pop those blisters you'll find zinc corrosion.

I suspect in the years to come, the high grade post-1982 "zincolns" that do not blister will be worth serious money.

tahoe98

at least they're not milk spots

ajia

<<If you pop those blisters you'll find zinc corrosion.>>

Is there enough time between the zink cleaning & copper plating for the planchets to get corroded?

ArizonaJack, those are different type of blisters than the ones you're familiar with!!

RWB

The only ones I've have break out like that are from 1913-1919..... (couldn't resist)

Broadstruck

A quick dip in Penicillin should neutralize it!

66RB

<< <i>ArizonaJack, those are different type of blisters than the ones you're familiar with!! >>




:snickerbunny;

errormaven

This is blistered plating. It's thought to be caused by a poor bond between the zinc core and the copper plating. A dirty surface on the zinc core can be a contributer. In most cases this is NOT caused by subsurface corrosion. You can see this in off-center cents. The blisters are only on the struck portion, indicating that gas expansion from the heat of the strike is responsible.

Subsurface corrosion can push up similar-looking blisters, but these tend to be fewer in number, larger in size, and generally localized.