How to make colour changing fog using blueprint actor

Yep, just what I wanted, thanks so much!

I wanna use a blueprint actor to create the exponentialheightfog to change colours over time using blueprints. I already set up the actor and the fog, but how do I exactly make it to change colour like every 2 seconds when playing in game?

Like this perhaps:

Image from Gyazo

You can use a Timeline + Lerp to animate it instead.