In terms of color and taste.

1. In terms of color: Black buckwheat noodles are made from buckwheat plus buckwheat husks and are black in color, while white buckwheat noodles are made from buckwheat noodles only and are white in color.

2. Taste: White soba noodles have a relatively delicate texture and no bitter taste, while black buckwheat noodles have a certain bitter taste.