The reddish color of the soup dumplings when cooking is due to the deterioration of the glutinous rice flour.

Because the glutinous rice flour used to make the dumplings has been stored for a long time, it has gone bad. The spoiled glutinous rice flour has been contaminated by a bacterium called Flavobacterium fermentum. This bacterium dies when heated and turns yellowish red (or pinkish red). Glutinous rice flour contains little protein and is easily infected by specific bacteria. Mildly infected flour will show a red color when cooked, and in severe cases there is a wine flavor. Therefore, it is not recommended to eat the dumplings when they turn red.

Soup dumplings Introduction:

Soup dumplings, also known as "Lantern Festival", "soup dumplings", "floating yuanzi", is one of the representatives of the traditional snacks, is one of the most popular Chinese snacks, is one of the most popular traditional snacks, is one of the most popular Chinese snacks. One of the representatives of traditional snacks, it is a ball-shaped food made of glutinous rice flour and so on. It is a ball-shaped food made of glutinous rice flour, usually with fillings, cooked and eaten with soup. It is also the most characteristic food of Lantern Festival with a very long history.

Because of this glutinous rice dumplings cooked in the pot and floating and sinking, so it was first called "floating yuanzi", and later some areas of the "floating yuanzi" to the name of dumplings. However, the dumplings symbolize the reunion of the family better, eating dumplings means a new year of family happiness, reunion, so is the first month of the fifteenth Lantern Festival essential food.