Analysis of the Positive Lead Vinegar Test
At some point, there was a test of lead vinegar. Everyone was by the side, looking attentively, looking at the fruit of the test.

After the test was completed, it was positive. The viewers were all shocked and discussed the cause. Or: "This thing contains lead, so there is a reason for it." Everyone thought about what they said.

A sage said: "The fruit of positivity should be investigated in detail. Investigate its source and distinguish it before you can understand the truth." Everyone agreed.

So everyone took the thing again and inspected it in detail. Explore its origin, examine its materials, and explore its preparation method.

After many inquiries, it was known that when the product was in production, it was mistakenly involved in lead-containing products, resulting in a positive lead vinegar test. Everyone sighed that this matter should be regarded as a commandment, and you should not act carelessly, and the investigation should not be meticulous, so as to ensure that everything is correct and stay away from hidden dangers.