This pen has a special invisible ink filled in it. When you write anything with this pen it will look like you have written nothing (The Paper will remain 100% Plain without any Marks) & to view the written material a UV (Ultra Violet) light has to be beamed on the message. As soon as you will flash a UV light on the content you will be able to read clearly what you have written & as soon as you switch off the UV light the content will again disappear.
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