noun
black and white string
Refers to a string that is black and white in color, often used in traditional Japanese crafts or ceremonies.
黒水引は祝儀袋に使われることがある。
Black and white strings are sometimes used on gift envelopes.
Compound of 黒 (kuro, 'black') and 水引 (mizuhiki, 'decorative cord'). The exact historical derivation is uncertain.