The use of lighting in the scene when Akane confronts Tougane in episode 10 is quite symbolic when viewed at from an animator's perspective. As explained on a forum:
" Upon Akane's arrival we see Togane standing with a backdrop of light which hides his face, a classic technique in the noir genre that relays a sense that Togane currently believes Akane is on his side (aka the light, representing truth, innocence, and control of the situation) while subtly relaying that he has alternate motives (which is why his face is painted Black). this is followed up with a birds eye shot where we see the long dark shadows that stem from Togane to drive home the point that he is bad. moving on to the moment Akane reveals that she is aware that Togane is lying we see a new blue light appear behind Akane while a low angle shot moves the green light from behind Togane to in between the two characters representing a shift in control of the situation. As the scene progresses the light begins to gradually shift away from Togane leading to a final close up where he is virtually all black. Meanwhile Akane can be seen clearly regardless of where the source of light is, emphasizing Togane's failure to paint Akane black."