I have the Sewline pencil with three colors of lead in it - pink, white, and black. I love the way it makes a nice sharp, easy to see line, BUT, I just finished a quilt where I used the black lead on a red Moda fabric and it looks like it's not going to come out. Plain water did nothing to remove it, so it's in the washing machine. I checked it once while it was filling up for the rinse cycle and most of the lines are still there. If they are still visible after this washing, I'm going to try a stain remover and wash again.
Oh, and in case you are wondering, no I didn't iron over the lines.
Ugh! Live and learn.
Jodie