“ seeds” into supercooled clouds which can remain a liquid even at temperatures as low as-40 degrees( negative 40 degrees is the same temperature for both fahrenheit and celsius).( S3) They now mostly use silver iodine to cloud seed instead of dry ice because it works better.( S4) It is true that silver iodide is considered a toxin by the Environmental Protection Agency, but the amount used for cloud seeding is not enough to be considered dangerous( S1). The method to cloud seed with silver iodine is the same as the method for dry ice. But in my survey most people prefered dry ice because its cleaner( PS)
In addition, there are now newer experimental methods such as dynamic cloud seeding which evaporates water into clouds, and there is also hygroscopic cloud seeding which dispenses salt into clouds, then