1. Enterprises and individuals, in the process of signing contracts and bill settlement, had better request the electronic version to print contract documents. When signing and filling out the bill, you should bring your own signature pen, stamp it or press your handprint when necessary, so as to prevent criminals from using the "automatic fading pen" to commit crimes.

2. The words written by the automatic fading pen will disappear immediately when it meets water. You can touch them with something with water. If they will disappear, be careful of being cheated.

Note: If you encounter this situation in your life, you should call the police in time to prevent more people from being deceived.