Shaihong: Sun-Dried Black Tea Cake, Steeped in Teasenz Glass Tea Maker

"Shaihong" literally means "Sun-dried red"*. Basically it refers to black teas that are sun-dried like pu erh. Because sun-dried black teas are suitable for long-term storage, they're often pressed in black tea cakes like the one in this video.
What is sun-dried black tea?
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Where to buy shaihong black tea?
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*Note that black tea is known in China as 'red tea'.