Ah I see what you mean. My character would be moving while the color is spreading throughout his body though. (Bringing his hand up to his face and changing expressions.) I'll play around with some of these ideas! I'm not sure if this would end up being too complex, but I may make two puppets, one cool tone and one warm tone. Using after effects or other software, I'd change the color of the cool tone puppet to match the warm tone puppet. So basically I'd animate the wave of light and skin flushing in a software. (Not sure how hard this will be or if I'll even be able to get the digital skin tone to match the actual warm tone puppet). After the character's transformation, I'd replace the cool tone puppet with the warm tone puppet for the rest of the animation.

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