Orion Fluorescent Dye Marker

Sprinkle this orange powder, and its fluorescein dye will turn snow a bright, fluorescent green. Write on the snow, draw an arrow or whatever. It's an excellent signal for rescuers to note your location. This handy product from Orion will be visible from a distance: a great aid for rescue.

Available from REI, West Marine, and Barre Army-Navy.