I love to draw on black paper with white charcoal. I use only sight-size method of measuring, which fits how I see and comes to me naturally. This method has advantage over other drawing techniques such as comparative and relational measuring techniques, because it's easy to see values on the subject.
Most art schools start teaching students to draw on white paper with a black pencil, unfortunately my mind resisted from the start, and over time I switched completely to draw with white pencil on black paper. I found it to be much more efficient, to seek and place the "visual light" of the subject on the paper. I focus my drawings (and painting) on the light source qualities - the intensity, angle and the effects of reflective light on the subject.
I took this same approach, for my oil painting techniques. I stain my canvas with burnet umber paint (Vasari Oil Colors or Winsor Newton) and never paint directly on the white canvas.
Here are few samples of my drawings from life models (about 3 hours) using this technique.