The key with anery versus ghost is the *quality* of the black pigment, not the quantity. Ghosts, instead of a true black, have dark chocolate, brown, gray, tan, or even purplish tone in the edges of the saddles.
So... as examples:
Torandre, dark ghost as a young snake:
Lia, light anery:
Up close of Tor's saddle edges:
Lia's saddle edges:
Dark bordered ghost hatchling:
More typical ghost hatchling: