Fade out not working

Hi guys, i have a list of the Player's body parts and i want the alpha to go from 255 to 0.
So at first i set all the parts to 255 and then i made a while loop to decrease the alpha step by step.
Somehow it doesn't work, any ideas why? Thanks

Code (CSharp):

1.     public IEnumerator PlayerDisAppear(float Timer, float Speed)
2.     {    
3.         //initialize
4.         for (int j = 0; j < BodyReferences.Count; j++)
5.         {
6.             Color tmp = BodyReferences[j].color;
7.             tmp.a = 255f;
8.             BodyReferences[j].color = tmp;
9.         }
10.      
11.         while (Timer > 0)
12.         {
13.             for (int i = 0; i < BodyReferences.Count; i++)
14.             {
15.                 Color tmp = BodyReferences[i].color;
16.                 tmp.a -= Speed;
17.                 print(tmp.a);
18.                 BodyReferences[i].color = tmp;              
19.             }
20.             yield return null;
21.             Timer -= Time.deltaTime;
22.         }
23.     }

 

The RGBA values in Color go from 0 to 1, not 0 to 255.

 

Haha oops!
Thanks