Purple is seaweed, just called different. Japanese kanji called seaweed, seaweed is the name of the Japanese, there is no seaweed in the Chinese this word, we call the Chinese nori.

But there are two kinds of seaweed, we make sushi with, that is, we eat leisurely, that is, the Japanese seaweed; the other is produced in Fujian, Guangdong and Zhejiang used to do the soup of the supermarket inside the cake, can only be called seaweed, it is best not to call seaweed, because this is Japan's name,, there is the meaning of the impostor of the Japanese product

Japan and South Korea have the same thing, the processing of different methods, different tastes, and also different. The flavor is also different. But seaweed for soups is only available in China

These are the same things in Japan and Korea.