Why not? any particular reason? I haven't seen many basses with walnut fingerboards and I was just wondering if any one knew why?
This question jumped in a couple months ago. A few good answers there why walnut shouldnt be used. An acrilized piece would be an option.
Here you go: http://www.talkbass.com/forum/showthread.php?t=436371&highlight=black+walnut+fingerboard