many uses:

12hr Chem light Cyalume technologies. ‘Snap light light stick Made in USA, Gov't issue type,. Top quality, long life. A good snap light has great uses for marking trails and paths, use as a navigation aid, broken apart the fluid can be spread over large or multiple surfaces (caution contains glass inside). A night time message could be written this way . Perfect for signaling and sending long range visual cues and codes by blocking on and off with hand etc,. Use chem light to see underwater in dark areas and at night for recreation, fish / food hunting. ( See Morse code and signal section in the ACW field guide for code sending). Spin on a long string for Hi-Visible beacon.