I tumbled/washed about 50 pieces of brass one time and threw them in the oven to dry, I don't remember the temperature or drying time because it was a couple years ago. But anyways I turned the oven off and left them In There to cool. My girlfriend at the time did not know they were in there and turned the oven on to like 425 or something to pre heat. She went to go put in what ever she was baking and realized there was a bunch of bass in there. They looked pretty similar to the pictures posted. I didn't wanna risk it and decided to just recycle them because my hands and eyes are more important to me then 50 pieces of brass.
I no longer dry brass in the oven. I put them in the food dehydrator at like 115 for a hour or so untill dry. Works great.
