Getting Rid of Sepia color

[Acies]

FadeSepiaColorTo(15.0f,1.0f);
Means that you set the sepia to 15 with the speed of 1.0f. This probably means that it takes 15 secs before it reaches 15. However, when you set it to:

FadeSepiaColorTo(0.0f,0.0f);
You tell it to change to 0 with the speed 0. Since there is no "speed" there is no change. Correct should be:

FadeSepiaColorTo(0.0f,1.0f);
(Change to 0 with the speed of 1.)