It's a useful way to observe the power of black. ^_^

You can also do things like leaving a white line where both sides are black, rather than having a white under-edge as many artists do (because they didn't plan ahead), and using hatching and cross-hatching (many parallel lines, and criss-crossing lines to suggest shading) to suggest the texture of cloth or fur.

Another fun inking bit to try is shiny metal: a white area for the highlight or sun-catching edge bordered by absolute black, then hatch or stipple (lots of dots) the black fading away to the edge of the metal.