Invisible Ink UV Marker

Are you looking for a better way to write your secret messages? How about going invisible! For those of you who like the secret agent approach to geocaching, we offer the Ultraviolet Felt-tip Marker from our friends at Markal. This marker produces an ink that is invisible under normal light, but glows brightly under a UV or black light! Some features:  Permanent, durable, fast drying and lead-free Xylene free ClipGrip Cap Marking temperature range from -50°F to 150°F Pen with cap measures about 5.75 inches. Shipping Weight 1.2 oz.