3.After 18 tealeaf producing factories were investigated, the results showed that the tealeaf of good-grade in the factories would alleviate the lead contamination in the tealeaf, while the commer tealeaf producing process can significantly increased the lead contamination in tea lead.
10.Tea leaves contain more caffeine (2.7 to 4.6 percent of the dried green tealeaf ) than does roasted coffee. But the concentration in the beverage averages somewhat less in tea.