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This actually lines up with real-world science. Different chemicals glow different colors when burned. Like in real life, where xenon burns blue when it's ionized (which is a thing with real ion thrusters), different fuels in Star Wars could lead to different exhaust colors.
crystalbridges.org
Engines, also known as thrusters, were devices used to propel vehicles across land, through a planet's atmosphere, or through the void of space. Engines could vary in size and shape, with some vehicles like podracers consisting of little more than two engines and a cockpit.[2] There were at least three categories of engines: repulsorlifts (which required a large mass to push against in order. Same reason Star Trek ships all have distinct color schemes per faction.
scifi.stackexchange.com
Starfleet is white/gray with blue/red engines, Klingons are green with red engines, Romulans are green on green, Cardassians are sort of an amber with orange engines, etc. All starship fuel colors in Star Wars Outlaws and where to find them - a full catalog with detailed overviews and locations of each cosmetic! I think it's also a possibility that the difference in color is based on the specialization of the fuel/engine (i.e., you could use X-colored fuel to make your engines more efficient in extremely cold temperatures, or you could use Y-colored fuel which would work better for heavier loads like capital ships or cargo transports, all at the costs.
starwars.fandom.com
Unofficial community for Star Wars, an American epic space opera franchise, created by George Lucas and centered around a film series that began with the eponymous 1977 movie. My five-year-old son noticed something in The Empire Strikes Back: When the Millennium Falcon takes off from Bespin (Cloud City) the light from the engines is red. In all other images it appears bl.
storage.googleapis.com
This category is for different basic engine types. Different reactors, different fuel systems (they all use the same fuel but utilize it at different efficiencies), and different methods of handling exhaust can create a massive variety of engine colors. Ultimately, no color represents something "more powerful" or generally faster, especially at sublight speeds.
geektyrant.com
The twin ion engine was a type of ion engine which propelled starships in space. The sublight drive was widely incorporated into various models of starfighters.[2] The engine was used in Sienar Fleet Systems' TIE fighter series and made the distinct high-pitched shrieking sound they were known for.[3] The TIE/sk x1 experimental air superiority fighter, also known as the TIE Striker, was a.