Red labels are counterfeit products, and green labels are authentic products. The green-labeled Yangchangzi is authentic. Because Yangchangzi is not protected by the exclusive right of trademark law, the famous trademark is registered with the homophony of Yang Changzi. The red-labeled Yangchangzi is a counterfeit product in the past two years, and the recipes of the two companies are also different. The red label Yang Changzi was made by myself and is not authentic.