Hi folks. I'm back with another query

I was creating an animation of my model and its almost complete. Now the designers wants to change the color of a part (actor in composer). I changed the color at few places but the problem is a lot of keys are storing the color property of actors. If I change the color at one key, the next key will bring back the original colr. I've got a ton of keys and updating the color at every key is impossible.

How do I change the color accross whole animation so every key is updated with the new color?