DO NOT RUN YOUR BRASS, AND FORGET IT OVERNIGHT!!! You will have camouflaged brass. Mine turned a nasty green. I ran my tumbler, way late into the evening, watched some TV, and went to bed. In the morning, I realized I had forgotten about my brass. The water looked really dirty, and when I rinsed my brass, it looked pretty ugly. Really clean, but ug-lee. I cannabalized my vibratory tumbler, to use as a brass sorter, so it was loaded ug-lee. Good thing my AR drops spent cases in a pile. They are tough to see in grass.