Originally Posted by
tartare
Yes - I do know that
Have a look at multiple ejection videos on the web.
Flames, yes.
A bit of white smoke, occasionally.
First time I've seen that degree of brown/black smoke.
And there's more from one seat than the other.
The Tutor is a 1960s era aircraft - does it still use the Weber seats?
Perhaps just a different type of propellant...
No familiarity with ejection seat boosters, but solid Ammonium Percolate (AP) propellant based rocket motors have a variety of exhaust characteristics - everything from dirty brown/black to white to basically invisible. It all depends on the propellant blend used - which in turn depends on the desired thrust characteristics.