How to check what a randomized list chose?

I have a randomized list of colors set up. There are 4 colors in the list.

Every time the "ball" gameObject collides with this gameObject, the color randomizes. I just want to set the tag of the gameObject to whatever color it randomizes to. In order to do that, I first need to check what the randomizer chose in the list and I'm not sure how to do that.

This video shows the randomize list code I used in full: https://www.youtube.com/watch?v=8Xx6ghSk668

void OnTriggerExit2D(Collider2D col)
{
    if (col.gameObject.name == "ball")
    {
        Color c = TintColors[Random.Range(0, TintColors.Count)];
           //scoretext++ (< haven't set this up yet. Ignore this)
        GetComponent<Renderer>().material.color = c;
           //When you score, the color randomizes again

           //Not sure what to do here v
        if (TintColors(1))
           //Not sure what to do here ^
           //If the randomizer chose blue (1 being the 
           // first element in the list)
           //So I can change the gameoject tag to "blue"
        {
            transform.gameObject.tag = "blue";
        }

    }

}