I have a large bandanna that I use for ink painting (to dry the brushes after rinsing them). I would like to toss it in the laundry so I can reuse it.

NOTE: The ink I use is NOT like pen ink; it's much more watery, and I'm pretty sure it will come out. (I accidentally got some ink on one of my teacher's placemats last fall. All she had to do was put it in the washing machine, and it came out like new.)

However, I'm concerned that the ink might wash into other clothes and stain them while in the machine.
If it helps to know: the ink is made of charcoal ash (from wood) and water.

Thanks in advance.