American Embroidery Supply Disappearing Ink PensFrom American Embroidery Supply
American Embroidery Supply carries Chako Ace disappearing ink pens in pink and violet. Either color disappears spontaneously when exposed to air or when contacting water. The time period varies based on writing pressure, writing material, temperature and humidity. To minimize the time it takes for the ink to disappear spontaneously, do not seal the garment in a bag that cuts off air ventilation. The disappearing ink is non-toxic, and the pens should be tested on scrap material before using, according to the company.