Many people don't know that Duliu old vinegar was once a tribute to the palace, and Shanxi old vinegar, Zhenjiang balsamic vinegar and known as China's three famous vinegar, but by Baoning bran vinegar, Yongchun old vinegar came later, and now retains the production of Duliu old vinegar brewing technology can be counted, the most well-known of which is Tianli, which is very popular in North China and Northeast China. In fact, the raw materials and brewing process of Duliu old vinegar are the same as those of aged vinegar, which can also be regarded as a kind of aged vinegar.
 
There are generally two kinds of solid-state fermentation process: solid-state raw meal fermentation and solid-state clinker fermentation, and Tianli Duliu old vinegar uses solid-state clinker fermentation, which has a higher starch utilization rate and produces more aromatic substances than raw meal fermentation. Tianli No. 1 old vinegar and No. 2 old vinegar are the classics of Duliu old vinegar, the taste is delicate and soft, and the total acid is not high, only 3.5g/100ml, which is also the reason why Duliu old vinegar is gradually eliminated. The old vinegar has a strong sour taste in the mouth, although the sour taste of the old vinegar is light, it stays in the mouth for a longer time, and it will disappear in 3-5 seconds.
 
Tianli products cover the middle and high grades, the choice is rich, as well as dumpling vinegar, spicy hot vinegar, cold vinegar, health vinegar and other types, lower grade products can be bought for more than 10 yuan, mid-range products four years old vinegar, six years old vinegar between 25-35 yuan, handmade vinegar series is more expensive, eight years of vinegar need more than 200 yuan.
 
In addition, all Tianli products contain caramel color and sodium benzoate, caramel color is used as a colorant to improve the color of vinegar, and the preservative sodium benzoate is added to prevent deterioration, the dosage is within the national standard, and the safety is not affected. However, at present, the vinegar market is chaotic and fiercely competitive, and Tianli has never innovated the old vinegar, and its market share is decreasing, and even the North China market with the best sales volume is gradually occupied by brands such as Hengshun and Zilin.