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Re:Starship – SN8 – High-Altitude Flight Test by rajup on Wednesday December 09, 2020 @06:11PM (#25366736)
Most likely the chemical used to (re)start the engine, triethylborane (TEB)

https://en.wikipedia.org/wiki/Triethylborane.

Re:Starship – SN8 – High-Altitude Flight Test by NikolaeVarius on Wednesday December 09, 2020 @06:19PM (#25366867)
Which it does not use
Re:Starship – SN8 – High-Altitude Flight Test by handol on Wednesday December 09, 2020 @06:18PM (#25366863)
I thought the raptor was going to use a spark plug.