Potential answers for "Colorless gas that makes colorful signs"

⭐⭐⭐⭐ NEON
⭐⭐⭐ ETHYLENE
⭐⭐⭐ SILICANE
⭐⭐⭐ HCL
⭐⭐⭐ HELIUM
⭐⭐⭐ ETHANE
⭐⭐⭐ XENON
⭐⭐⭐ ETHENE

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