SAKURA Pen-Touch Paint Markers – UV Marker Pen for Black Lights – UV Visible Ink – 1mm.  
Suitable for use on papers as well as most non-porous surfaces. Great for adding special effects to mixed media art!  These markers leave invisible ink that will appear a light blue when under a UV/black light.  Shake with the cap on before writing to get the paint flowing and mix the color.  Before use, depress tip in upright position to release any internal pressure. The paint flows from the chamber directly to the tip of the marker.

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