_____________ gas is filled in glow signs.
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argon gas
Neon gas gives off a red glow. This gas is normally contained in tubing that is clear in color, and when illuminated, projects the brightest red color. Almost everything else is filled with argon gas. When you see yellow, blue, green, white or any of several other shades, these tubes are filled with argon gas.
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Argon gas is filled in glow signs
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