This is an interesting subject. Only once was I sorely tempted but in the end, I didn't. While finishing this stock,I became fixated on the blank area about 2 inches back of the grip cap.....I thought it begged for just one more black mineral line.

I experimented with a soft HB pencil, and then an artist's charcoal pencil on the bare wood. I was able to draw, darken, smudge, erase the line with great ease. I thought the carbon was the ideal medium in this case; very easy to apply (and remove since it didn't penetrate), impervious to solvents and light fade, it would have lasted forever. But I chickened out.