Oolong tea is partially oxidized - usually between 20% and 80% oxidized. Because there’s a wide range of possible oxidation, there are many types of oolong teas with myriad characteristics. Tea masters carefully watch over the production process, creating lighter oolongs with less oxidation and darker oolongs that are more thoroughly oxidized. Producers consider the production process for oolongs to be a fine art and often keep certain aspects of their process a secret. Tea connoisseurs value the subtle differences in taste and aroma that can be found across a sampling of oolongs.
The Oolong tea caffeine content is moderate.