Experimenting with Tesla coils and noble gases is a lot of fun. Each gas has its own unique color, depending on purity level and other factors. This Tesla Scepter is filled with neon gas. It glows brightly in the dark when you get it close to a tiny Tesla coil.
You may also want to see:
Tesla coil neon scepter science toy -- gadgetify
The above video shows how it works.
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