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Stopping the StartCoroutine with blinking function

The solution may seem simple but it took me a while to figure it out so I thought I’d note it here using a blinking function.

  public IEnumerator animateTint(GameObject obj,Color newColour,float speed = 2){
        Color originalColor = newColour;
        Color targetColor = newColour;

        Color defaultBtnColor = new Color();
    ColorUtility.TryParseHtmlString (btnColor, out defaultBtnColor);

    while (obj.GetComponent<Renderer> ().material.color != newColour) {

        Material objMat = obj.GetComponent<Renderer> ().material;
        Color curColour = objMat.color;

        if(closeEnough(curColour.r,targetColor.r) && closeEnough(curColour.g,targetColor.g) && closeEnough(curColour.b,targetColor.b) ){
            //objMat.color = newColour;
            print ("change tint "+targetColor);
            if(targetColor == newColour){
                targetColor = defaultBtnColor;
                yield return StartCoroutine(CoroutineUtil.WaitForRealSeconds(1)); //2
                targetColor = newColour;
            //yield break;    

        buttonCode btnCode = obj.transform.parent.GetComponent<buttonCode> ();
        objMat.color = Color.Lerp(curColour,targetColor, speed * Time.deltaTime);
                objMat.color = Color.white;
            yield return null;
        //print ("tinting "+curColour);

        yield return null;

The main part is

yield return null;

Other things going on here are converting a hex code string to a Unity colour using. (btnColor is a variable specified previously).

ColorUtility.TryParseHtmlString (btnColor, out defaultBtnColor);
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