How to make GUITexture's texture become invisible?

Unity Engine
1

So I want to make texture smoothly invisible,

so wrote like,

public Texture2D moneyTex;    
public GUITexture moneyIcon;
    public float mIconSpeed = 60;
    public float mIconBlurSpeed = 2;
    Rect moneySize = new Rect(-61, -29, 110, 110);
    Color moneyC = new Color(128f, 128f, 128f, 128f);
    float y; 
    float b = 128f;
    public bool startMoneyAnimBool;


    public void ShowMoneyAnim(){        // show money icon moving    
        moneyIcon.texture = moneyTex;
        moneySize = new Rect(-61, -29+y, 110, 110);
        y += Time.deltaTime * mIconSpeed;
        moneyC = new Color(128f, 128f, 128f, b);
        b -=  Time.deltaTime * mIconBlurSpeed;
        moneyIcon.pixelInset = moneySize;
        moneyIcon.color = moneyC;
        if(moneySize.y > 60){
            y = 0;            
            moneyIcon.color = new Color(128f, 128f, 128f, 128f);
            moneyIcon.texture = null;
            startMoneyAnimBool = false;
        }
    }

But when I activate this function, icon does not blur, when I checked guitexture, the color value is (32640, 32640, 32640, 32640) (r,g,b,a)

seems maximum value. Why and how to fix this?
(testes with various icon blur speed changing, but same)

2

solved.
(128,128,128, 128 ) should be (0.5f, 0.5f, 0.5f, 0.5f)