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These compact sized UV blacklight reactive invisible ink markers by DirectGlow use high quality semi-permanent invisible ultraviolet ink. Each marker

DirectGlow Invisible UV Blacklight Reactive Ink Marker with Separate UV LED Light

This pen is out of this world! It features invisible ink on one end and a normal ball-point pen on the other end. Kids will have extraterrestrial fun

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Opticz UV Blacklight Reactive Large Tip Invisible Ink