Views:4 Author:Site Editor Publish Time: 2019-06-03 Origin:Site
1. The green grapes were soaked in ethrel diluent and after a day or two, the green grapes become purple grapes. This grape is uneven in color, contains less sugar, and has less flavor and is harmful to humans
How to identify: Consumers can distinguish between appearance and taste. First of all, you can understand the normal maturity of grape varieties. At the time of purchase, if each grape is very dark and has good brightness, it is likely to be ripe. Conversely, if a bunch of grapes can identify ripe and unripe grapes, then the grapes are not ripened. Moreover, there will be a thin layer of white powder on the naturally ripened grape skin, which will be wiped off. According to the taste, the ripening grapes are not sweet, while the natural ripe grapes are sweeter and smoother, and the local color of the fruit stalks is relatively new.
2. mango: quicklime yellow
Some fruit farmers are making huge profits, and they use the swelling agent repeatedly during the planting process. The ingredients of the swelling agent mainly stimulate the unity of the cells, and promote the unity and volume of the cells in the fruit to increase the production purpose, so that some strawberries are large in size, good in color, and even some are grotesque. The swelling agent belongs to the category of pesticides. Excessive use affects the quality of the fruit. If the consumer consumes a large amount of strawberry with a large amount of swelling agent, it will cause great damage to heath. Especially for patients with kidney disease, it should be prevented from eating too much.
How to identify: First, look at the categories. Most of the big strawberries are conical, so be careful if the shape is too strange. Secondly, the hormone strawberry is unevenly colored and has poor gloss, and the color is blue and clear at the bottom of the fruit stalk. In addition, the sesame seeds on the surface of normal strawberries are golden yellow. If even the sesame seeds are red, you should be alert. Again, normal strawberry flesh is bright red with few cavities. The hormone strawberry can be opened casually, and the flesh is white in color and has more cavities. Finally, normal strawberries have a high sweetness and an average spread of sweetness. Hormone strawberry tastes boring and smells unscented.
3. orange: pigment dyeing
The orange color on the market is particularly beautiful, causing many people to drool. When you encounter such an orange, be careful, it may be a dyed orange. In order to make the orange color more beautiful and sell better, some vendors will inject the pigment into the orange skin and then apply some paraffin on the skin to make the orange look new, but such orange will fade. There are also merchants who even clean and dry the moldy oranges, and then wax the oranges with paraffin wax. In this way, the oranges that had been moldy and gray-faced turned red and bright in the blink of an eye.
How to identify: First, the dyed oranges look very red on the outside. If you look carefully, you can find red spots on the skin of the epidermis, some orange appearance and even red residue. Next, wipe the orange surface with a wet wipe. If the wet wipes turn red, it is clear that the orange may be dyed. If the orange is not dyed, only a light yellow color can be seen after wiping the wipe. In addition, the oranges that are heavily stained will turn red; the oranges that are not dyed, the oranges are white and green. Finally, the dyed oranges are sticky to the outside; the oranges that are not dyed are more natural to touch.