The refill ink of the thermal eraser pen contains color-developing material, color-developing agent and color-changing temperature regulator. At room temperature, the chromogenic material and chromogenic agent combine to produce color. However, when the temperature rises to a certain extent, the color-changing temperature regulator will organize the combination of color-developing substances and color-developing agents, thus making the color disappear; When the temperature drops to a very low temperature, handwriting will reappear.

Under the baking of the lighter, the writing of the erasable pen gradually disappeared. Therefore, to be on the safe side, please don't use erasable pens for valuable securities and important documents that need to be signed.