Technical Background

Properties of a Better UI Material are animated through three variables available inside Better Image as well as Better Raw Image:

materialProperty1, materialProperty2 and materialProperty3.

They connected to the first, second and third defined Property of your material (like: Hue (1), Saturation (2), Brigthness (3)).

These properties are mapped to the properties of the respective material. 

How to animate

Simply like everything else:

You usually don’t have to care about the technical background too much because the properties can simply be modified in the inspector with the displayed names there during recording an animation.