No, this image is misleading! It may look as if I'm painting on thick dark grey hair, but most of this oxide will be washed off to leave thin traces in the crevices so that the hair strands of the hair he has left (!) will be a bit more clearly defined.
The head has been fired in the kiln for its first 'biscuit' firing and will be fired again after painting on the oxides (manganese dioxide, a dark grey seen here, and a light sponging of red iron oxide to warm up the skin tones a little, subtly darkening here and there to add some more life.) Once the head is fired, the painted on oxides cannot be removed, so I'll have to be very careful. Every time the head is fired, it shrinks up to 10% so I have to do an equal number of firings for his neck and collar.
I've protected his face with masking tape and cling wrap to avoid giving him unwanted dark grey spots on his skin.
The next job will be to decide how to treat his cravat and collar: cravat maybe have cobalt blue oxide and collar a small pattern of dark grey, cobalt blue and red iron. Mmmmm, watch this space.