Fluorescent Dye Marker - 2-PackPowder 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: 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.