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Silver Iodide
Silver iodide bears the chemical symbol Agl and is a photosensitive inorganic compound. Varied uses for silver iodide are found in the areas of photography, medicine and cloud seeding. Its place in the process of cloud seeding is due primarily to its high level of solubility. With its crystalline structure, Agl bears qualities similar to ice, which allow it to undergo heterogeneous nucleation, or freezing.
Dry Ice
Also known as dried ice, frozen carbon dioxide (CO2) is a common chemical used in cloud seeding, as it is often used as a cooling agent. During the process of sublimation, dry ice disappears into the air as a vaporous mist, as opposed to leaving a puddle of water like ice does when it melts.
Hydroscopic Agents
Hydroscopic agents, such as salt, are also used in the process of cloud seeding. In addition to many different salts, these agents include, but are not limited to, sugar, honey, sulfuric acid, ethanol and methanol. Their use as agents in cloud seeding is primarily due to hydroscopic agents' ability to attract and hold water molecules.
Tarpenes
Released by trees, tarpenes act as a natural agent of cloud seeding. Tarpenes are sent into the atmosphere more actively during warm weather. During this type of cloud seeding, clouds reflect sunlight, thus making it possible for the forest, for example, to regulate its own temperature. This large class of organic compounds is included in different compounds, such as resin, steroids and essential oils of plants and flowers.