Lead acetic acid and sulfuric acid, when the two meet, the change occurs. Lead acetic acid is mild in nature, while sulfuric acid has strong corrosion properties.

When lead acetic acid encounters sulfuric acid, such as yin and yang contact, the reaction starts quickly. Looking at the change, there is precipitation. In this precipitation, lead sulfate is also white and dense, and sinks at the bottom of the vessel. And during the reaction, acetic acid also escapes, and the sour aroma is dispersed around.

The reason for this change comes from the chemical properties of the two. When sulfate and lead ions meet, they combine to form lead sulfate, which is difficult to dissolve in water, so it is like precipitation. Acetate combines with hydrogen ions to form acetic acid.

Although the ancients did not elaborate on the wonders of chemistry, they may have seen such changes in practice, using their wisdom to observe the changes in nature, and applying them to various things in life. They may have their uses in crafts and medicine.