Ultraviolet light and highlighter pens

A few weeks back, we had fun playing with infrared light , remote controls and black pens (some of which absorb infrared as well as visible

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Pilot FriXion Light Erasable Highlighter - Violet

Description, Write your secret message: this invisible ink pen will write your secret message., Once your secret message is written with this

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First, use this pen to write anywhere, and then use the effects of ultraviolet light, heating, etc. Using this invisible ink pen,you can write any

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