Quad Gradual Colour Change

Hi,

I'm trying to change the colour of a quad, used as background. Specifically I'm attempting to change the colour of each r, g and b values as a Color object incrementally within a Update() method. So far I'm not having much luck. I've noticed the following line of code will change the quads colour accordingly...

 GetComponent<Renderer>().material.color = Color.black;

However if i attempt the following...

     private Color skyColour;
     private float r, g, b;
     
     void Start () 
     {    
         r = 206f;
         g = 140f;
         b = 21f;
 
         skyColour = new Color(r,g,b);
     }
 
     void Update () 
     {
         //skyColour = new Color(r,g,b);
         GetComponent<Renderer>().material.color = new Color(r,g,b);
     }

It doesn't assign the desired colour. Even including alpha values. The colour is set too white. The shader is set to Unlit/Color.

I've breifly looked into solving the problem myself but I figured posting up here might help save time whilst looking into it. Any help would be muchly appreciated