Animated video: 37 principles of chemical reactions and their dangers—Volcanic Flame Demon
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Principle: The red powder on the outer layer is ammonium dichromate, which is unstable; when heated it decomposes to produce large amounts of dark green ash (chromium trioxide) and a bright red flame. (NH4)2Cr2O7 (s) → Cr2O3 (s) + N2 (g) + 4 H2O (g) This process is very similar to a volcanic eruption. And what’s hidden inside is the mercuric thiocyanate “Pharaoh’s Snake” mentioned in the previous issue. Fun fact: Ammonium dichromate has a nickname called “Vesuvian fire” due to this effect of its. It was used in fireworks and early photography. Using mercuric thiocyanate feels like summoning Cthulhu… Recorder: Trollator. Danger: High. Ammonium dichromate is toxic and irritating, just like all hexavalent chromium compounds. Heating in a sealed container can lead to an explosion. Regarding mercuric thiocyanate, please refer to the previous issue.
Ammonium dichromate is as toxic and irritating as all hexavalent chromium compounds
Burnt Cr2O3 has a dense crystal structure similar to that of corundum; it is insoluble in acids, but can be converted into soluble salts through melting—Fr. Encyclopedia