I'm trying to create a magic halo behind an object. For this I decided (maybe, improperly - but I'm a newbie) to use hair. So I grew up a long hair, assigned an emissive material and made its colour change with location.
But now I also want that halo to gradually change colours as the time progresses. I cannot find any time-based shaders in the nodes collection, only as a composition node - but that one is to my understanding only applicable to the whole scene animation.