I like to dry my wet tumbled brass in the oven at 225 for 30 minutes, then let it cool in the oven overnight to to insure that it's dry. Long story short, I left the brass in the oven for a few days. Wife pre heated the oven to 425 for some nom nom nom onion rings, and lo and behold. When she went to place the onion rings into the oven, there sat my brass. The brass was in that environment for about 25 minutes. It now has a nice rainbow hue to it in the right light. What type of damage did I do to that brass?
It's no real loss as it's only range .223/5.56 brass. Only 100 pieces that I was part of a lot that I will be turning into .300 BO Brass. But I would like to know what damage I did to the brass? Why is it now a rainbow hue? Obviously due to the high heat at a prolonged time, but metallurgically speaking, what happened to the brass? Should I throw it away now as it may be unsafe to use?
It's no real loss as it's only range .223/5.56 brass. Only 100 pieces that I was part of a lot that I will be turning into .300 BO Brass. But I would like to know what damage I did to the brass? Why is it now a rainbow hue? Obviously due to the high heat at a prolonged time, but metallurgically speaking, what happened to the brass? Should I throw it away now as it may be unsafe to use?