Highlight1

for (int i = 0; i < parent.transform.childCount; i++)
{
    Renderer rParentNew = parent.transform.GetChild(i).gameObject.GetComponent<Renderer>();
    _zwColor[i] = rParentNew.material.GetColor("_Color");

    Color newZWColor = new Color(_zwColor[i].r + highlightFactor, _zwColor[i].g + highlightFactor, _zwColor[i].b + highlightFactor, _zwColor[i].a);
    rParentNew.material.SetColor("_Color", newZWColor);
}

//Restore
for (int i = 0; i < parent.transform.childCount; i++)
{
    Renderer rParentNew = parent.transform.GetChild(i).gameObject.GetComponent<Renderer>();
    rParentNew.material.SetColor("_Color", _zwColor[i]);
}