The yellow cake inside China Tea’s Big Red Seal is a round tea made by China Tea’s Yellow Seal around 2000. Due to the large number of hairs, it turns golden yellow after aging, so the tea cake is yellow, so it is wrapped The paper is marked with eight red Chinese characters in a circle with the word "tea" in yellow, and the inner mark with the word "tea" in green.

About the early 1960s, a kind of Pu'er tea with yellow tea characters appeared, called "Huangyin Yuan Tea". There are not many of these yellow-seal round teas, and they are divided into "big yellow-seal" and "small yellow-seal" according to the size of the cake body. Huangyin Yuan Tea is a Pu'er tea product produced by the tea factory to promote tea products and increase commodity circulation. It is the predecessor of today's Qizi Pu'er Cake Tea, and is also the "ancestor of modern Pu'er tea products that blend tea greens." Chinese tea Huangyin is known as " "The ancestor of modern Pu'er tea blended with Chaqing" has the trademark "Bazhong Tea" on the inner side, and the trademark "Bazhong Tea" is printed in the middle of the outer packaging paper, with the word "tea" in yellow and "China Tea" above the trademark. Company Yunnan Province Company" (traditional Chinese characters), and below the trademark is "China Tea Brand Round Tea" (traditional Chinese characters).