Color different (?)

the bottom 4 are those I've got today...the color looks different than the regular ones (upper) -


what's the cause?

 

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# 1- Dirt
# 2- Dirt
# 3- Totally different coin
# 4- Dirt

 

#3 I use a 1999 and a 2007 to demonstrate the color different the color is somewhere in between

 

The 99 is a SBA with a silver color the 07 is a golden dollar, the color is...gold

Edit

SBA Sac dollar


of course there is a color difference

 

The Sacagawa is made out of a different metal then the Susan B. Anthony. I thats what you are asking

 

:welcome: Alan,

The same type or denomination of coins will color or tone differently depending what they are exposed to during their circulating life.
I have been carrying a US Grant presidental dollar coin in my pocket for about only 1 month now. It is showing major signs of wear & coloration from rubbing against the cents, nickels, dimes, & quarters in my pocket as I spend some & add some each day.

 

I have Sacagawea's that the manganese brass outer layer has gone brown like a copper cent and one went a red-ish color. I've had Susan B. Anthony and IKE's go gold colored or even blue.

 

Those golden colored coins get ugly quickly in our pockets. Of course, there is always the arguement that they were ugly to begin with, but that's a different thread.