I tried a piece of fabric that had too much white in it. I made the tea and put the fabric and tea in the sink to soak, did not agitate. That must be the key, because I had darker spots here and there. They were small, but it looked like the fabric had measles. Tried to bleach it to get the tea out, but that didn't work. Put the fabric away, but would like to find out how to get the tea out now, or at least lighten it.