Tonight I have tested a new Product introduced into New Zealand. The Sew Write pen. Especially made for marking fabrics. The pen markings iron out as well as rub out.
The pens come in three colours. Black, Blue and Red.
I proceeded to mark my batting and blocks with the blue.
I'm not sure if I have been sold a "lemon" but the blue pen stopped marking after a few blocks. I also noticed that I just couldn't draw one line, I had to redraw it so it could be seen. Note the markings in the bottom block (left)
I proceeded to work with the red and that appears to be working ok at this point.
Lines disappeared quickly with the iron.
I will buy another blue and continue using these over the next couple of months.
They are very reasonably priced.
I will keep you up to date on these pens.