Silver iodide

Silver iodide is an inorganic compound with traces of impure silver. It is commonly used in silver-based photography and for seeding clouds with rain.

Noah Tall's Cloud Busters were missiles that were filled with silver iodide. He used them to keep Superman busy and away from his fortress. Otherwise, if Superman would have ignored the missiles, they would have detonated over the United States and flooded the whole country.

Appearance
Super Friends
 * Season 1: The Balloon People