It is no secret that you can do all kinds of fun experiments with Tesla coils. Take these Noble Gas Keychains for instance: they are filled with pure Noble Gases such as Helium, Argon, and Neon. They glow when you get them close to a Tesla generator.
Tesla Coil Gun vs Noble Gas Keychains ⚡ Gadgetify
Oudin Coil vs Noble Gas Keychains -- Gadgetify
The above videos show these around a Tesla coil gun and Oudin Coil.
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