>>13038300Regular hydrogen is blue. That's why water is blue. Oxygen is obviously clear.
Green hydrogen is green because of radiation. It is actually an isotope of regular hydrogen - tritium.
People are into tritium these days because they either;
A) have solved nuclear fusion, and want to use this in their reactor,
B) want to use it in those glowing keychain things, which stay lit without electricity for like years, or,
C) they want to use this highly toxic substance to kill everyone, thereby returning their biomass to Mother Gaia and saving the planet from the rabid human hordes.
Obviously, option C dominates.