As a keen sewer myself, I've been struck by the perennial problem of brightly & neatly marking dark fabric. Chalk isn't always easy on fine fabrics (thinking of Liberty Lawn). Felt pens and biro residues can bleed in the wash and I've worked my way through all manner of specific sewing pens. But today, after a lot of hunting, I struck gold!! The best, easiest, bright white marker. Very neat, easy to use & no effort needed. Just a totally perfect instant bright white line. The pen came from Paperchase. It doesn't smudge & dries almost instantly. I'm going back to buy a bagful. Happy sewing! 