Just bought the red peanuts, put in the water a bubble, two or three seconds later, it will obviously fade, the water has become red, what is the matter? On September 6, Ms. Xia, who lives in fuqingyuan, Chenghua District, Chengdu, bought red peanuts at the farmers' market and planned to stew pig's feet with peanuts. When she took them home, she found that the peanuts would soon "fade" in the water. Ms. Xia suspected that the peanuts had been dyed.
The public is worried that the water will still turn red after repeated flushing
Ms. Xia's daughter is pregnant for five months. She heard that red peanuts are nutritious and blood enriching. On the morning of the 6th, she went to the nearby farmers' market to buy nearly a kilo of red peanuts and prepared to go home to stew pig's feet for her daughter.
After taking it home, Ms. Xia put the red peanuts in a basin and washed them“ I washed it three times, and the water flowed away. I didn't see any problem at that time. " Xia said that until she put the peanuts into the pressure cooker, she found that the water in the pot turned red and the peanuts turned white. In the face of faded peanuts, Ms. Xia can't help worrying that these peanuts have been "beautified"? Unable to determine whether the peanut was harmful to human body, she gave up eating it.
It's normal for peanut skin to fade
In order to confirm what Ms. Xia said, on the afternoon of the 6th, the reporter specially went to the market to buy red peanuts. According to the vendor, there are two different varieties of common peanuts, red peanuts and red peanuts. Red peanuts taste more fragrant and replenish blood. Many people buy them, so the price is slightly higher. The survey found that these red peanuts are nearly vermilion. Taste one of them, which is similar to ordinary peanuts. Then pour the red peanuts into the basin. In less than one minute, the water begins to turn pale red, while the red of peanuts gradually turns pale, wrinkled and white. When the reporter asked "why the peanuts fade", many vendors told the reporter that it was "very normal" and claimed that it was "the natural pigment in peanuts".
Experts say that water discoloration is a normal phenomenon
"It is normal for red peanuts to fade when soaked in water." Song Xu, a biology professor at Sichuan University, said that the red skin of peanuts is darker because it contains more natural pigments. It is normal for red peanuts to turn pale red after soaking or boiling in water. It is a misunderstanding to think that faded peanuts must have been dyed. But Professor Song also said that if the faded color is very deep, just like that in a dye vat, then the peanuts may be dyed.
How to identify if the red peanut has been dyed?
First, from the appearance point of view, some peanuts have "small white spots" at one end, because the red skin of peanuts shows the color inside. If the peanuts are dyed, these exposed "white spots" will also be dyed red.
Second, because the red skin is very thin, if the peanut is dyed, the color will penetrate the red skin. After peeling off the red skin, you can see that the inside of the red skin will also be light red.
Third, put a wet red peanuts on a piece of white paper and rub it. Although the white paper is wet, there should be no red residue. The dyed peanuts will be discolored when they are damp or wet, and the red color will be left when they are rubbed on the white paper.
Experts said that these three methods have some truth, and can be used as a reference to identify whether red peanuts are dyed.
