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Are you one of the expressive individuals seeking to share in and get pleasure from a pen pal enjoyable time? In these pictures, you will note how my invisible ink pens are made weatherproof. Ink fluoresces white-blue under UV. Write your secrets and keep them hidden with the magic invisible ink pen. Reverse the pen. Reveal your secrets! What sort of pen can I invent? What sort of ink do you use to void a document? These prime secret diaries include a double-ended invisible ink pen! From Shock birthday events to revealing a prime secret message to their mother and father or grandparents. This was years later after I moved out of my one-bedroom condominium.