invisible ink pen, uv light

详情

With the Secret Sweetheart pen you can continue to write these sappy love letters without the fear of someone else reading them. Each plastic pen features ink that is made of special high-brightness compounds that are invisible to the naked eye, but magically illuminate when exposed to ultraviolet light. A keychain black light which our company supplies, allowing you to read any secret notes sent to you by your lover. Battery included.