• teft@lemmy.world
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      6 months ago

      Probably nickel and/or salts of barium. Copper burns blue as a pyrotechnic colorant.

      • Cyborganism@lemmy.ca
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        6 months ago

        Ah ok. I was going to say nickel but I did a quick search and somehow I read that it was copper.

      • FellowEnt@sh.itjust.works
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        6 months ago

        Depending on the salt you can make both blue and green. Copper sulphate flame test is a pretty common school lab practical isn’t it?

    • Pennomi@lemmy.world
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      6 months ago

      A lot of spaceship debris looks like this because copper is used in a lot of rocket engines.

    • perestroika@lemm.ee
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      6 months ago

      Alternatively or additionally, I think oxygen plasma glows blue or green, because northern lights (near the poles, at least) are greenish.