"Neon signs. There used to be a neon sign on every business. But neon signs are full of chemicals (some rather dangerous) like neon, argon, and mercury. Not to mention they can be a fire hazard and very inefficient with electricity use compared to LED’s. In fact, in America, a lot of places have made them illegal or at least changed building codes to no longer allow them. I’m in the business, and have friends that went to school for neon bending (it requires a lot of chemistry) that are now struggling."

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