Invisible Ink UV Hand Marking Pen

Use this hand marking pen to make an invisible mark that is only seen under ultraviolet light. Great for clubs, concerts and any gathering where re-entrance needs to be easy. Opticz Blacklight Reactive Marking Pen with Invisible Readmission Inks are suited for use on skin, fabric and similar porous or textured surfaces. The Blue ink is invisible/colorless and reacts blue under UV or blacklight. Invisible inks work best with fluorescent uv lighting. Readmittance type inks are designed for use at amusement parks, social gatherings and sporting events Inks are non-toxic, fast-drying and non-transferable