Buy mandarins, tangerines, and oranges that feel sticky to the touch.

Why do some navel oranges stick to your hands? Professor Liu Xuejun from the School of Food Engineering of Jilin Agricultural University revealed the secret. Liu Xuejun said that generally navel oranges need to be waxed, especially off-season navel oranges (navel oranges in March and April every year). However, many preservatives for tangerines, tangerines, and oranges contain substances such as shellac and panasonic glycerides. If these substances are excessive, they will penetrate into the skin of the fruit. After eating such tangerines, tangerines, and oranges, people will Bad for health. In addition, some people do not use fruit wax on fruits but use industrial paraffin wax and add pigments. The thicker the wax, the better it looks on the outside, but the faster it rots on the inside. This is what people often call "dyed oranges", like this Because oranges are dyed unevenly, color differences will appear on the surface of tangerines, tangerines, and oranges. [Meishijie]

Experts remind you not to buy navel oranges that have a thick layer of substance on their skin, are shiny and feel sticky to the touch. When buying oranges, especially navel oranges, you should choose normal color and look at the pores on the skin. Good oranges have more pores on the skin and feel rougher to the touch, while oranges with poor quality have fewer pores on the skin and feel relatively smooth to the touch. If you wipe a good orange with paper, you will find that the color of the paper will not change. If pigment is added during processing, it will fade after rubbing.

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