Yo uso un rotulador soluble al agua de punta muy fina y se marca muy bien, desaparece con el tiempo y con el agua.
Lo adquirí en tiendas de costura o mercerías es la mejor opción que encontré.
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I am using an air soluble marker, it's V-Clear Air erasable pen. Otherwise Bohin mechanical pencil works fantastic if you have coloured or darker fabrics, they have the led in many different colors
I actually like Frixion pens and markers because I can use a small craft iron to fix any mistakes I make as I grid or mark. Then, when the whole piece is finished I can iron my work like normal and poof! All marks are gone!