Black tea fungus, also known as "Weibao", is a substance beneficial to human body after fermentation with sugar, tea and water. Its own acidity inhibits the growth of harmful bacteria and is very beneficial to human health, especially for atrophic gastritis and gastric ulcer.

The shelf life of black tea flavor treasure is generally one to two years, and the storage time cannot exceed three years, which is easy to deteriorate due to improper storage. Don't pursue the year when drinking black tea. Black tea, which has been widely used for three years, is not as good in taste and aroma as the new tea of that year. As a fully fermented tea, black tea does not need to be fermented in the later storage process, so there is no problem of late transformation, and it can be drunk directly after production.