The ink used in the thermal eraser pen is a color ink mainly made of water-soluble solvent, supplemented by polymer film forming agent, pigment and other additives. When the temperature is higher than 60 degrees Celsius, the color of ink will disappear completely, and when the temperature drops below 0 degrees Celsius, the color of ink will reappear.

When the erasable pen is at room temperature, the color-developing substance and the color-developing agent combine to produce color, but when the temperature reaches a certain level, generally above 60℃, the color-changing temperature regulator will prevent the color-developing substance from combining with the color-developing agent, thus making the color disappear. The principle of wiping pen is mainly thermal reaction. The ink of this pen contains color-developing material, color-developing agent and color-changing temperature regulator. At room temperature, the chromogenic substance and chromogenic agent combine to generate color, which can be erased when students write typos.