Invisible Ink Pen (UV Light Included)
The common reason that people purchase this pen is to use it on an artwork assignment in university because some students tend to steal the work and pass it off as his/her own. The second most common reason is using it on wedding invitations as some people forget to put their names on the RSVP. And the third most common reason is using it on a product that is being sold in a store as some buyer come back to return the product complaining that it didn’t work and want a full refund but in actual fact, the returned product that is not working was not purchased from the store in the first place.
So, if you’re facing any of the problems above, this is what you should get.