if there is a k-colouring of elements of X
such that facially adjacent elements of X receive different colours. We prove that: (i) Every
plane graph G = (V, E, F ) has a facial 8-colouring with respect to X = V ∪ E ∪ F (i.e. a
facial entire 8-colouring). Moreover, there is plane graph requiring at least 7 colours in any
such colouring. (ii) Every plane graph G = (V, E, F ) has a facial 6-colouring with respect
to X = E ∪ F , in other words, a facial edge–face 6-colouring.