Tea pigment is a water-soluble phenolic pigment extracted from tea. Roberts E.A.H.( 1959) divided it into theaflavin TFs, thearubigins TRs and theabrownin, and put forward the molecular formula and structural formula of TF, and expounded the formation way of tea pigment in tea fermentation, which is still the chemical basis of tea pigment. Before 1990, only 0.6- 1.6 kg of tea pigment can be extracted per ton of tea, which is known as "green gold in medicine". With the development of purification technology, the purity can reach 99. 1% (the test results are subject to the tea quality supervision, inspection and testing center of the Ministry of Agriculture), and the ability to produce high-purity tea pigments on an industrial scale has been realized.

Tea cream: After processing and fermentation, fibrous substances in tea leaves and tea juice are separated in a special way, and the obtained tea juice is reprocessed and reduced to a higher level of solid instant tea. -Excerpted from Pu 'er Tea Paste-A Forgotten Health Culture. Modern tea cream production technology is a kind of tea cream production technology developed on the basis of court production technology in Qing Dynasty. This method is made by imitating the climate, temperature and environment in tea cream in Qing Dynasty. Under more complicated and meticulous procedures, the extraction and concentration of tea soup are controlled at about 40 degrees Celsius. Using the characteristic that aromatic substances and effective components must volatilize and precipitate at a certain temperature, the original substances of these tea leaves can be effectively dissolved into tea soup to the maximum extent, and then gathered into paste.