Learn everything you need to know about working with Colors in Unreal Engine 5 Niagara! 
In this in-depth tutorial, we cover all the methods, tricks, and modules to control, randomize, and drive particle colors dynamically in UE5.
https://dev.epicgames.com/community/learning/tutorials/jOaYV/unreal-engine-ultimate-guide-to-color-in-ue5-niagara