The lead salt method detects tannins
tannins, which can react with a variety of metal ions. The lead salt method takes advantage of this property to detect tannins. Take an appropriate amount of liquid to be tested and add lead acetate test solution dropwise. If there is tannins present, precipitation will be formed quickly.

Gein tannins have a polyphenolic hydroxyl structure and can form a stable complex precipitation with lead ions. This reaction is quite sensitive and is commonly used in the identification of tannins.

When operating, pay attention to the amount of lead acetate test solution. Excessive addition or other components will also form precipitation, which will interfere with the judgment of the results. And a blank control is required to determine whether the precipitation is caused by tannins. By this method, the presence or absence of tannin in the sample can be preliminarily determined, providing a basis for subsequent research or application.