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Tubes with inert gases excited with high voltage. From left to right: Helium, Neon, Argon, Krypton and Xenon. Each tube emits a different color and intensity. Stock Photo | Adobe Stock
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HMME Rare Nobel Gas Sealed Tube 99.999% Luminous Gases Krypton Helium Neon Argon Xenon Element Collection (5 Pack): Amazon.com: Tools & Home Improvement
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