White tea has the reputation of one year's tea, three years' medicine and seven years' treasure. The aroma and taste of white tea in different years are different, but from the perspective of tea cakes, it presents different color proportions. White tea with superior raw materials will show different color distribution and aroma due to different years, such as purple, gold, pewter and orchid fragrance, which is the "Zijin Bailan" series of white tea.