The Flash's Lightning Colors Represent Connection To The Speed Force. The Flash movie's different lightning colors are explained through their connection to the Speed Force. This is an extra-dimensional source that gives speedsters their powers in DC Comics.
However, when Savitar ran without his armor, his lightning was yellow, meaning that Savitar's lightning wasn't actually white; it just looked that way because of the way it reflected off of his armor.
Yellow and blue: After Barry Allen took the Velocity X serum, his lightning briefly turned blue and emitted the same sound Hunter Zolomon produced when he was running.
Electrokinesis: Kid Flash is able to generate powerful red electricity when he runs. The cause of Kid Flash's red lightning is due to his relatively weak connection to the Speed Force. In the New 52, red lightning is the result of the user having a weak connection to the Speed Force that needs to be developed further.
When XS ran into the room, Nora's body was only generating purple lightning energy. Whenever pre-Crisis Nora would be running, she was producing both yellow and purple lightning. That was a representation of Nora having inherited Iris and Barry's respective lightning colors.
THE FLASH NEW Lightning Colour Explained! NOT A RETCON!
Is there a speedster with green lightning?
The Emerald Speedster throws a green lightning bolt Lightning Throw: The Emerald Speedster can generate enough electricity so that he can launch a powerful green lightning bolt at an opponent.
Wally West is the Fastest Flash. He has been confirmed to be the fastest being in the entire DC Multiverse. While most to all speedsters can make a connection and draw upon this force, Wally "mainlines" power from the Speed Force itself and cannot be cut off from the source.
After usage of the Velocity drug made his body now produce sapphire blue lighting, a sign of his extreme over-usage of it. Even while only slightly accessing his powers, Zoom would produce a powerful aura of blue lightning from his body that always emanated off of him, whether he was moving at super speed or not.
ORANGE/YELLOW - Yellow lightning represents a pure or natural connection to the Speed Force. At the same time, as speedsters continue to develop their powers, such as Jay Garrick and Barry Allen, they eventually begin to exhibit a more orange coloring.
So when we first see Savitar, he's trapped in the Speed Force, so only people with a connection to the Speed Force, such as Barry and Wally, can see him. After he got out of the Speed Force everyone could see him, so only speedsters could see him while he was trapped in the Speed Force.
When Barry's time remanant ran around the machine that was going to destroy the mulitverse, he burnt up and that is Savitar. When he burnt up from running so fast, you could see his face was burning. That is why Savitar has a weird "pizza" scar on his one side of his face.
Meanwhile, in 2049, the Negative Speed Force reached out to Eddie Thawne who was living a false life under the name of Malcolm Gilmore. It struck him with a bolt of red lightning to give him a direct link to the Negative Speed Force and left him an old redacted CCPD file about Eddie.
The 'Red Room' – Barry's trademark dimly red-lit studio (apparently the red light makes you look good while you're sweating) usually comes part and parcel with the Barry's burn. With a bank of top-of-the-range treadmills and mirrors reflecting and refracting your sweaty bod back at you, there's kind of nowhere to hide.
He replicated the accident that gave the Flash his powers, but was driven insane and became obsessed with ruining the Flash's life upon learning that he was destined to become his greatest enemy–the Reverse-Flash. Fueled by jealousy and hatred, Thawne travels throughout time to torment and destroy the Flash's life.
White+Blue: August Heart/Godspeed exhibits both White and Blue Lightning(mostly white), and this is caused by him gaining speed through Tachyons, and by using a Future Version of the Velocity Serums.
When Barry got his Tachyon device, he was running faster than Zoom, who was over 4x faster than Barry's fastest ever speed. Which is obviously faster than we've seen Reverse-Flash. But Barry was never able to catch Eobard when he was running (excluding his past self) so we've never seen Reverse-Flash at top speed.
Who is the slowest speedster in all of fiction? Honestly, it's Zoom. He is completely slow because he doesn't actually run, rather he travels through time.
As the fastest of the two speedsters, the Black Flash primarily focuses its attention on Impulse until the latter sacrifices himself to destroy the demonic speedster, which goes on to inspire Garrick to come out of retirement and form the Teen Titans.
After Barry's death in Crisis on Infinite Earths, DC took the opportunity of the shifting mantle to decrease the new Flash's speed, making the hero less over-powered in its new canon. Originally, Wally could run slightly faster than the speed of sound, while Barry could run at the speed of light.
While Barry emits yellow lightning in his wake, Iris trails purple lightning instead. Not only that, she also had a purple speedster suit. "There's a specific reason we designed the costume the way we did," executive producer Todd Helbing says.
In 2049, August experimented with tachyons to give himself speed, presumably made a suit for himself as the speedster "Godspeed" and began stealing chemicals to recreate the Velocity 9 serum.
