Fluorescent Dye Marker - 2-Pack Powder that turns snow or water into a bright fluorescent green signal.  You can write in the snow or on the ground.  Serves as an excellent signal for rescuers to mark your location. Features: * Environmentally Safe * Waterproof Container * 2-Pack Warning [https://productimageserver.com/prop65/6pt.png]WARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov [http://P65Warnings.ca.gov].