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neovb t1_j24a5g1 wrote

Different propellants produce differently colored plumes of smoke. For example the kerosene/liquid oxygen propellant used in the Merlin engine has a yellowish tint due to carbon in the exhaust gas. But most likely any of the beautiful color you are referring to is simply a matter of atmospheric conditions and lighting when the rocket is launched.

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Dependent_Creme688 OP t1_j24av41 wrote

There have been so many agencies launching rockets but blue fumes I have only observed in are space x rockets

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CapeTownMassive t1_j24dit5 wrote

How efficiently they burn is a factor too, not just type of fuel.

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neovb t1_j24eziv wrote

There are only two things that would impact the color you see: the physical properties and chemical composition of the exhaust plume and the atmospheric conditions at time of launch. So one of those two things (most likely actually a combination of both) would cause the color you are referring to.

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