2, ginkgo nuts can be divided into three parts, the outermost yellow flesh for a layer, the middle white hard shell for a layer, the innermost very thin red skin and the white kernel included for a layer. The outermost layer of yellow flesh is the main reason for the odor. Because the outer skin contains volatile substances, such as: butyric acid, acetic acid hydrogenated leucoacid, ginkgo biloba brass, etc., and direct contact with a variety of gases in the air, a chemical reaction will occur, and finally the odor we smell. Among them, when the ginkgo fruit just seasoned to pick or pick up, is not directly touch with your hands, because the skin of the ginkgo fruit at this time contains acidic, will have a bad effect on human skin, a little light is the emergence of allergic phenomena, so it can not be Yongshuo touch, the correct practice should be to wear gloves to touch.