Disappearing chalk in pen. Perfect for temporary marking in sewing rooms, embroidery services, sewing ateliers, design studios etc. Writes on fabrics, paper, wood, plastic. Disappearing time is about 24 h. This may vary with fabric's type and surroundings conditions such as temperature, humidity and air circulation. Erasable easily and quickly by eraser or by water. Before use test it on redundant material's scrap.