The Inmarsat-5 from SpaceX launched earlier today. I was watching the broadcast and noticed a brief green flame during ignition. What caused this? 
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Ryan
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2That's a beautiful screen shot! If you search for "green" here you can see that it's been asked already here and there's a good answer. You can read more here as well. – uhoh May 16 '17 at 03:29
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That's the TEA-TEB mixture used to start the engines. The boron in the TEB is responsible for the green flame.
Tristan
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