The exact science behind the difference was never explored fully in The Flash, largely because Iris opted to not continue having meta-human powers by the end of the episode. Most fan theories regarding Iris's purple lightning point to Iris's relationship with the Speed Force, since this is the most obvious difference between her and Barry. Related: Why Supergirl's Heat Vision Is Blue In The Arrowverse Based on the character from DC Comics, The Flash has shown a willingness to divert from its source material, and explore core concepts in its own way - such as the nature of Barry's speed, how superspeed and time travel work, and the concept of the "Speed Force."
![trapped girl flash hint trapped girl flash hint](https://image.shutterstock.com/image-photo/hands-catching-rail-feeling-no-260nw-1007049469.jpg)
The Flash follows the adventures of a forensic scientist who develops superhuman speed abilities after an experimental particle accelerator explodes. The Flash is the second show in the CW's Arrowverse, which began with Arrow in 2012. The reason why Iris was stylized so differently from her husband and masked hero, known as "The Flash," was never fully explored in-universe however, there are numerous fan theories as to why - as well as a narrative explanation that makes total sense as an aesthetic behind-the-scenes decision.
![trapped girl flash hint trapped girl flash hint](https://www.thewrap.com/wp-content/uploads/2021/05/Summer-Movie-Preview-2021.jpg)
When Iris West-Allen (Candice Patton) received Barry Allen's (Grant Gustin) powers in The Flashseason 4, episode 16, "Run, Iris, Run," she was given a distinct look from her husband - including her own unique purple lightning effect.