Operation Dew refers to two separate field trials conducted by the United States in the 1950s.
Operation Dew took place from 1951 to 1952 off the southeast coast of the United States, including near Georgia, and North and South Carolina.
[2] The tests involved the release of 250 pounds (110 kg) of fluorescent particles from a minesweeper off the coast.
[2] Two of the trials dispersed clouds of zinc cadmium sulfide over large areas of all three U.S. states.
[2] Dew II involved the release of fluorescent particles (zinc cadmium sulfide) and plant spores (Lycopodium) from an aircraft.