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Invisible ink pen and rich verity of vibrant Exterior color like in this magic message pen. This color are fluorescent. The versatile use is write or paint with this magic pen. Once a secret message is written with this invisible ink pen and wait for few seconds and after flashlight on the cover of the pen. These Invisible Ink Pen normally write with the invisible ink then light your message with the UV light to make it visible see what was written! It includes a mini LED UV black light with batteries, so you can view your messages. The words written by this secret magic pen it can't be erased.so you can mark your personal property with your house number and zip code in case of theft with these top secret UV pen. This black light pen invisible ink pens Invisible words is necessary when you need to write something secret. It also can be used as a currency detector it is very useful secret agent for his spy mission. The modern day all persons uses these pens and Ultra Violet light for secret missions. Spy pen invisible ink is a perfect gift for your secret friends. Students can highlight text books and still sell the book when they finish their coursework with these UV black light pen.