雞內金为普通家禽雞之胃內膜,俗称“雞肫皮”。在杀雞时自腹中取出雞肫——胃,用刀切开抖刷去其未經消化过的食物,將其里面一層有韌質而略帶襞皺之皮膜輕輕揭下;晒干即得。規格鑑别:雞內金呈角質或膠質狀,顏色黃亮(亦間有紅褐色或帶綠色者)、干燥、瓢大不粘雞毛者为佳,有縱縐或横皺紋。但商品中亦常有鴨肫皮混入,鸭肫皮多呈碟狀圓片形,外面顏色为暗綠色,內面灰褐或灰白色a肫皮色黃、片大而薄;鸭肫皮色綠、片厚而圓。較易辨認。此外;由于地区环境和鷄的飼料不同,我国北部各省所产的鷄內金質厚而重,江南产品質薄而 Ji Nei Jin is the stomach lining of common poultry chickens, commonly known as “chicken suede.” At the time of killing the chicken, remove the chicken gizzard-stomach from the abdomen. Cut it with a knife and brush it to remove the undigested food. Gently peel off the skin with a layer of tough and slightly wrinkled skin; dry it. Got it. Specification identification: Chicken gold is horny or colloidal, yellowish color (also between reddish-brown or greenish), dry, scoop large non-stick chicken feathers is better, there are mediastinal or transverse wrinkles. However, ducks are often mixed with duck skin. The duck skin is mostly discoid. The outer color is dark green, the inner surface is grayish brown or gray and white, and the alum is yellow, large and thin; duck skin color Green, thick and round. More recognizable. In addition, due to the difference in the regional environment and chicken feed, the gold produced in chickens in northern provinces of our country is thick and heavy, and Jiangnan’s products are thin.