But where else can I ask?

While handwashing bras in the sink--if the water turns a dingy color, is that dirt or some of the dye leaching out? I'm talking about black bras or beige-y "nude" ones.

I usually wear three times before I wash. Sometimes four if I'm busy/lazy/it's winter, etc. I honestly am not a perspirer. Obviously, though, sweat is not the only thing on our skin and I'm not making excuses. I should probably wash them after one or two wears...I'd need to buy a few more, and also be much more organized. And I don't want to wear them out faster, either. I spend a lot on each one (due to my size).

TIA