Green, blue, gold, and more: What the different colors of hydrogen mean

Hydrogen is a colorless gas. So why use the rainbow to describe it?

Hydrogen is a colorless gas. But if you’ve done any reading about the future of energy, you’ve likely seen it identified by a number of different colors—ranging from turquoise and aqua to green, yellow, and red. So if hydrogen doesn’t have a color, why use the rainbow to describe it?

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