Between heaven and earth, there are many kinds of things, and there is a matter today, which is related to the response between\ (H_2S\) and lead acetate test paper, which cannot be ignored.

When the gas of\ (H_2S\) encounters lead acetate test paper, it becomes obvious.\ (H_2S\), with special properties, its gas can be felt. Lead acetate test paper, plain white like snow, then encountered\ (H_2S\), the color changes like life.

The cover\ (H_2S\) is sulfur, active, and combines with lead ions in lead acetate. A new thing is born, its color is black and brown, attached to the test paper. This change is not accidental, but the principle of things.

In the past, the Fang family observed the change of things, and used this method to distinguish the existence of\ (H_2S\). Looking at the color change of the test paper, you will know whether\ (H_2S\) exists or not. Its method is simple and effective, and it is very useful in the way of observing things. Although the years have passed, this method still exists. It is the foundation for exploring things in future generations. It helps everyone to know the wonders of microscopic things and the reasons for the change of things. It is also necessary to be sincere.