Write down lead vinegar strips
Yu taste and smell a technique, which is related to lead vinegar strips. The method of making it requires a lot of ingenuity. Prepare lead first, melt it into a liquid, soak it in paper, and then add vinegar to make the two phase.

The use of lead vinegar strips is comparable to unusual things. In some situations, the nature of testable things. If you see gas, use lead vinegar strips to approach it. If the color of the paper changes, it can be known that the gas contains sulfur. When sulfur is covered with lead vinegar, it can react, and the color of the paper changes. This is its magic.

Or in pharmaceutical shops, people also use lead vinegar strips to check the purity of medicinal materials. If the medicinal materials contain impurities, the lead vinegar strips will often appear abnormal, and the doctor can distinguish their advantages and disadvantages based on this, so as not to mistake people.

I look at the lead vinegar strips, although they are small, they are very useful. It can help all kinds of affairs and observe subtle changes. It is a wonderful thing in the world.