When we use the eraser at the tip of the pen erased, which is a rubber with heat resistant properties are specially written to erase ink, it will cause the heat from satire, and a higher temperature (approx. 60 ํ C. The substance that causes the color change according to the temperature (C) shall make a separate ink color (A) and substances that cause color (B) from each other makes the ink color change ink color that is transparent enough, and if the principle of operation of the stencil is removed as described above, it will be a question whether, if the temperature is lowered.Transparent ink to go back the same or not. The answer is that?.? By bringing the document put plastic bag sealed and placed in the freezer, and the color will start to come back when the temperature is-10° C ํ. And come back to clear 20 degrees when fully ํ C- Therefore, do not take the pen erased the most important document in the final.