Related Clues:

• Advertising sign
• Brightly colored
• It doesn't react well
• About 1% of the atmosphere
• Vegas sign
• Ginza glower
• Blindingly bright
• Scientific discovery of 1898
• Light bulb gas
• Hard-to-combine gas
• Plymouth model
• Element in arc lamps
• Broadway luminary?
• Odorless gas
• Ginza night glow