The purple trace of cold noodles in the sealed bag may be moldy, or it may be because other substances have been added to the cold noodles. In this case, for your health, it is not recommended that you continue to eat.

Seal the cold side of the bag. If it is opened, it needs to be frozen. It can also be stored in sealed vacuum for two days and needs to be eaten as soon as possible. You can also keep it in plastic bags and hang it in a cool and ventilated place for a day.