I have two French-style bows...one an older German-made bow, the other a recent import from Shar. The older one has black hair, the newer one has white. The difference in tone between the two is surprising. The older bow with black hair is very dark sounding with little definition of the note edge. The newer bow with white hair is very nicely defined and clear. The newer one with white hair has a larger tip, is a little lighter and thinner, a bit more flexible. The older one with black hair has a somewhat stouter stick and less flexibility. How much of this has to do with the hair and how much with the bow itself?