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Lulin's green color comes from the gases that make up its Jupiter-sized atmosphere. Jets spewing from the comet's nucleus contain cyanogen (CN: a poisonous gas found in many comets) and diatomic carbon (C2). Both substances glow green when illuminated by sunlight in the near-vacuum of space.
Originally posted by W3RLIED2
Copper doesn't burn green. Copper oxide does however.
It could be very possible that there are other metal/oxides that burn green...