Adger auto-vanishing pen

About Product:Name: adger fade pen\nBrand: adger\nColor: red, purple, white, blue\nSize: 15 cm\nProduct features\n1. Environmentally friendly non-toxic ink, harmless to human body, with a shelf life of 1-2 years; 2. The time of color fading is related to the material, temperature, humidity and other external environment. Generally, red color will disappear within 1-7 days and purple color will disappear within 2-14 days.\n3. Purple and red can make the scratch fade quickly with water or a color eraser. White can also make the scratch fade quickly by hot ironing or color eraser