How to use two pairs of chopsticks in the hotel, one black and one white?

In this case, white is the public chopsticks, vegetables are put in their own bowls, and black is eaten by themselves.

Public chopsticks are placed on the table to hold food, so you can use public chopsticks to hold food for others, but not for yourself. It is polite to put chopsticks in your mouth into your own bowl. Private chopsticks are for your own use. Use public chopsticks to pick up the dishes in your bowl.

In some high-end restaurants downtown, there are generally two pairs of chopsticks, one black and one white, one public and one private. Diners can choose which pair to use as public chopsticks.