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the way I've done it is by using argon-Mercury with a non-phosphore coated yellow (novial) glass tube. Krypton, and Xenon, give off a dim white glow under normal gas fill pressures. Argon without mercury is dim lavender. Helium is a fleshy colored beige, and NEON of course, is a bright orange red... more red.

I also have some old Uranium Glass that was rumored to actually have some real uranium in it... it seems to glow bright lime green without any power to it. But when lit up with Ar/Hg, it really glows a brilliant yellow-green!

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12y ago
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Q: Which gas is used to make yellow-green neon signs?
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