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$\begingroup$ You could use ionised oxygen... but I see another answer's already covered that. $\endgroup$
– wizzwizz4
Commented Dec 12, 2016 at 18:45
1

$\begingroup$ Copper burns green. Is there any way to introduce a helluvalot of copper into a star? Say, ejection from a supernova (which is where all heavier elements originate) into another smaller star? $\endgroup$
– SRM
Commented Dec 13, 2016 at 4:45
3

$\begingroup$ @SRM "Copper burns green" brings us back to needing oxygen, since that's what "burning" is. And if we already have the oxygen, we don't need copper for green. $\endgroup$
– HopelessN00b
Commented Dec 14, 2016 at 22:28
2

$\begingroup$ Huh. I never thought about that. You're right. It's one of those things I discovered as a kid and never mentally updated for adult chemistry knowledge! $\endgroup$
– SRM
Commented Dec 14, 2016 at 23:28

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