The traditional crystal ball in cold weather can only be used in cold drinks. After adding hot drink, the colloidal properties of crystal balls in cold water change, the taste becomes soft, there is no toughness, and it will become soft after cooking.

Crystals in cold water are natural food extracted from the cell wall of deep-sea red algae. Round in appearance and chewy in taste, it belongs to very good food. It got its name because cold weather must be made in a cold and dry climate in winter.