The black label represents five years of aging, the silver tower represents six years of aging, and the golden tower represents eight years of aging. The longer the water tower is aged, the more mellow the taste and the stronger the vinegar taste.

Old water tower vinegar is a specialty of Qingxu County, the capital of mature vinegar in China. Old water tower vinegar is made from high-quality sorghum, barley, peas and other grains through steaming, fermentation, smoking, drenching and drying. It is one of the four famous vinegars in China, with a history of more than 3,000 years, and is known as "the best vinegar in the world".