Pyrazole has been prepared through the dehydrogenation of 2 pyrazoline in which catalytic amonts of sodium iodide acts as dehydrogenation agent in sulfuric acid.
As to metal halide torch with gallium iodide is special rise 403nm and 417nm wave crest, and the highest wave crest 417nm has conspicuousness and good effect to exposal Diazo material.
In the 1940s, scientists discovered that dropping particles of silver iodide into cloud tops, made the tiny water droplets condense and could stimulate precipitation.
The UAE already uses a technique called cloud seeding to try and increase their rainfall, which means they intentionally release certain compounds, like silver iodide, into the clouds.
On stormy days, pilots load up small planes with these special flares full of chemicals like silver iodide and fly to the edge of thunderstorms to launch the flares into the clouds.