Olga Adler Absolutely! You would have a choice of a painted black finish instead of stain (with sheen levels ranging from satin to high-gloss), or a semi-transparent black stain, which would look really dramatic.
When using a vintage piece of furniture for the bathroom sink, chests and cabinets work best. They make it easy to hide the necessary plumbing while giving you additional storage for towels and other necessities.