My pencil marks came out, but I am still trying to get out the gutta. Washed it by hand a few times, then in the washing machine twice on gentle cycle, and then in the washing machine again with a few towels on the long heavy cycle.
Weird! My inktense block background lost almost no color, but the dye na flo wouldn't stop pouring out. I attribute my problems to inadequate heat setting.
Pencil marks all washed out, must be all that scrubbing.
There is colored gotta, and I'm thinking I'll try parchment paper on my light table while I paint so I can see my lines better.
I had trouble seeing the gutta and went inside the pencil as well, next time I'll make changes in pencil first. The pencil washed out after I used a little brush on it and like you most of the colour came off but I like that look. I can use stitch to define it again and add more colour. Perhaps I didn't iron it long enough I used Pebeo setacolor.