testing pens on fabric

Before I buy any more pens to write on fabric, I thought I'd check and see how well the ones I already had worked.
The big picture below shows the progress from the original writing on freezer paper-backed muslin, through handwashing and finally machine washing hot. Below that are the individual scans.
The grayness on the handwashing is from the ink, but from the machine washing it's also from some new batiks I washed. There was quite a bit of ink released, judging by the darkness of the two color catchers I used.
My conclusion? I can use the Edding 8400 CD marker without worry. The Stabilo OH Pen Universal and the Staedtler Permanent Lumocolor can also be used, but I need to be careful to write lightly.