Fading/changing either background or text color over a timed period. NOT a transition.

Ok, so what I'm looking to do here is have the passage background (or text, either will work) color slowly fade to black as a 10 second timer counts down and have it reset to its original color when the player comes back to the passage. (It's looped; the player has to click a button to reset the passage before the 10 seconds is up or it's game over.)

Possible? Ideas?

Thanks for taking the time to read/answer!