Black teas are oxidised; green teas aren’t: that’s the difference. With oolongs, it’s more complicated. They can be oxidised a little, a lot, or zealously. Their oxidation rate can range from 10% to 70%. Of course, a lightly oxidised oolong will have a more vegetal aroma, while a more oxidised oolong will develop woody, fruity notes. Whatever the level of oxidation required, the processing steps are the same: withering, sweating, roasting, rolling, then drying. The sweating stage is essential. It involves alternating periods of stirring the leaves with periods of resting them, as illustrated by this photo. The aim of this stage is to encourage oxidation while removing the natural moisture from the leaves.
Time to sweat
26 October 2018