Lead acetate test paper test
This is the main method for those who test the material with lead acetate paper. If the paper encounters a certain gas and the color changes, it is known that the material contains a certain quality.

First make the liquid of lead acetate, soak the paper in it, take it out and dry it in the shade, and then get the test paper. When using, place the paper near the object to be tested, if the color of the paper gradually changes, it can be detected.

If the sulfur compound is tested, and the gas encounters the lead acetate test paper, the paper will turn black. This is a sign of the combination of sulfur and lead. And test other gases, each with its own changes.

Perform this test, be careful. Paper should be stored properly, so as not to be damp, so as not to lose its character. And when operating, avoid the interference of miscellaneous gas, so as to obtain accurate results. According to this method, the hidden substance in things can be clearly observed.