My bet it you either used too much Lemi-Shine or left it too long. I did the same thing. I can run mine for 1hr for a good clean or 2hrs for a great clean. After that it does not help. When I forgot it over night..... It turned bronze.

Quote Originally Posted by Slapps74 View Post
Just went this route. If you do you need to tumble with media first if your case lube on the brass. I made the mistake of not doing this and my brass was a bronze color. Had to let it all dry and then re run it thru the media. After that you have to check all of the primer pockets.

i have to agree that stainless is the way to go. It is expensive to start and it's a longer process than the media. I love the final product my STM Rebel 17 turns out.