1. Gallbladder rupture: When the black-bone chicken was slaughtered, the gallbladder of the black-bone chicken was broken and bile infiltrated into the chicken, resulting in bitter taste of the black-bone chicken soup.

2. Excessive addition of medicinal materials: Many Chinese medicinal materials, such as Angelica sinensis, Radix Rehmanniae Preparata, Ginseng, Polygonatum, etc., have been added to the black-bone chicken soup.

Black-bone chicken is rich in protein, B vitamins, melanin, amino acids, nicotinic acid, vitamin E, iron, potassium, sodium and other minerals, with rich nutrition and good nourishing effect.

Black-bone chicken, also known as black-bone chicken and Wushan chicken, has a history of more than 400 years. There are white hair and black bones, black hair and black bones, spotted hair and black bones, all flesh and blood and black bones. Black-bone chicken has the characteristics of light weight, rich nutrition and early maturity. After hydrolysis, black-bone chicken powder contains 18 amino acids, including 8 essential amino acids, of which 10 is higher than that of ordinary broilers, and carotenoids and vitamin C are also higher than that of ordinary broilers, so it can be used as medicine. In addition, it also contains a variety of trace elements and macro elements, such as calcium, phosphorus, iron, chlorine, sodium, potassium, magnesium, zinc, copper and so on.