What is the difference between the white and black bow hair of erhu? Why is the white one good?

The bow hair of erhu is made of ponytail. The black ponytail is rough, and the sound drawn is rough and dry, lacking delicate beauty. The white ponytail is smooth and supple, and the sound drawn out is more detailed. The white ponytail is more durable, and the black ponytail is easy to break. So the black one is better. Most players use white ponytails.