We generally say that Porphyra haitanensis is black, shiny and crisp, and Porphyra haitanensis is the best. But be sure to look carefully. Some lawless elements brush oil on purple mining to increase brightness and weight.

In addition, there is laver, which Koreans eat. Porphyra yezoensis is expensive. Generally, China doesn't eat kimbap, but it's good to eat it in China.

When buying laver, you must look for the trademark. The new "lucky laver" is good, with good quality and cheap price. Use Baidu to search for "good luck laver" and you will see specific information.