Brass discoloration

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dtwalters said:
Does anyone have an explanation as to why the two outer shells are discolored? They are all Winchester 38 Special shells that I have reloaded multiple times. After firing, they are decapped, wet tumbled in Brass Juice and stainless steel pins for about an hour, rinsed and then left to sit overnight in a toaster oven that was pre-heated to 250˚F for 10 minutes and then turned off. The other 998 turn out just like the center one. Odd!
(This post has been edited for clarity.)
View attachment 1022148
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Looks like the pipes on my Shovelhead. Heat bluing.
 
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