It's excellent for drawing on fabrics and knits. Perfect for the most delicate fabrics. Use in sewing studios, sewing rooms, etc. to mark seam lines, flaps, etc. It leaves no marks or stains. Marks disappear on their own after about 2 days or immediately with a steam iron. Disappearance time may vary depending on the type of fabric and surrounding conditions such as temperature, humidity, and air circulation. Unnecessary marks can be easily removed with a brush.