The patent for using silver iodide was made in 1976 by Bernard Vonnegut and Henry Chessin , based upon work that had been going on since 1946 by Vincent Schaefer and Irving Langmuir.

“Common agents include silver iodide, potassium iodide, and dry ice, with hygroscopic materials like table salt gaining popularity due to their ability to attract moisture.”

So you’re just wrong. Flat out wrong.