Can any penny enthusiats help me out? 1985 D with weird coloring *scan included*

Today I was looking through a few thousand of pennies I have accumulated from pocket change over the last 5 years, and noticed one with an odd color. It is a 1985 and has a D on it. I scanned it in the middle of two other 1985 pennies, and was hoping someone here could shed some light as to the noticable color difference. Thanks in advance for any help.

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Comments
Lance.
<< <i>I don't see any pennies in your photo. I do see some cents.
Having some fun with the sportscard guy huh?
-Paul
<< <i>link >>
It looks like you might have a legitimate error!
-Paul
the improper 'brass' mixture
pieces.
Sean Reynolds
"Keep in mind that most of what passes as numismatic information is no more than tested opinion at best, and marketing blather at worst. However, I try to choose my words carefully, since I know that you guys are always watching." - Joe O'Connor
If you heat a cent up enough, you will induce the zinc to migrate through the copper.
Voila. Brass through the miracle of chemistry and heat.