The color will disappear if you rub it with the special rubber. Please do not use for certificates, addresses, etc. that must be removed. Do not place in direct sunlight or in high temperatures. The ink will be colorless when the temperature is over 60 degrees Celsius. Erased brushes may return if reached within -3°F (-10°C). Do not use for writing other than paper. Depending on the type of paper, such as thermal paper, and the characteristics of the print may be unsuitable for erasing. If you rub the eraser rubber with dirt on it, the paper surface will be dirty. Please wipe off any dirt before use.