"We had a kettle; we let it leak:
Our not repairing made it worse.
We haven't had any tea for a week...
The bottom is out of the Universe.
~Rudyard Kipling"
This tea is fully fermented. During fermentation the leaves are rolled to break up the leaf cells and a natural oxidation process begins turning the leaves black. This type of tea accounts for 90% of the worlds tea production.