N1I1E1L1L1O1I1N1G2
10 points
NIELLOING is validvalid
NIELLO, to decorate with a black compound of sulfur [v]
NIELLO, to decorate with a black metallic substance [v]
NIELLO, to decorate with a black compound of sulfur [v]
NIELLO, to decorate with a black metallic substance [v]