Smell: It is mainly to check whether there is any peculiar smell or sulfur smell on the surface of ginger. Poisonous ginger has a strong smell of sulfur. If you taste it, you will find that the taste of ginger is not strong or has changed. The second taste: the taste is unique, the taste of ginger is not strong or the taste has changed, so you should buy it carefully; Third, look: normal ginger is rough, dry and dark in color; "Poison ginger" looks smooth, like waxing, very tender and light yellow. The skin of "poisonous ginger" is easier to peel off than normal ginger, and the color difference between inside and outside is great after crushing. Four releases: Generally, ginger has a long shelf life, while "poisonous ginger" will go bad and moldy in a few days after being exposed to the air.