Have a disappearing marker that evaporates over several hours that's called Air Erasable Vanishing Pen/Marker. It has no company name on it only remember my girlfriends sister who is an artist gave it to me and it is in a silver case. Also, picked up children's water markers in different colors that can blend into the fabric better.
A version of this has been available for years for quilting. It was a purple disappearing pen. Then sometimes it would not fade out, so quilters pretty much abandoned it. Hopefully, this is an improved version of this pen.
I was having problems with the purple pen not fading. I also had trouble getting the white fabric marker off, and Tailors chalk comes right back when the fabric dries. This pen is brilliant. it is gone when you iron it.
I have been using something like this for years and it is very good, mine works with a little water
I meant to add, they are made by pilot and they are friXion erasable felt tips.