Article on how the picture was made: https://petapixel.com/2020/04/28/this-once-in-a-lifetime-meteor-photo-was-captured-by-accident/
Link to the photograph website: https://www.prasenjeetyadav.com/#explore
this post was submitted on 05 May 2024
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Probably nickel and/or salts of barium. Copper burns blue as a pyrotechnic colorant.
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?
Ah ok. I was going to say nickel but I did a quick search and somehow I read that it was copper.