Type A potassium perchlorate is used on the leads of fireworks and firecrackers, and the produced leads have a slow speed effect. They can be used to produce leads of 90 to 130 seconds per meter, and on the sound of fireworks, the produced fireworks sound has the characteristics of long duration and pleasant sound. It can also produce other strange sounds. When used on the color of fireworks, the produced fireworks have bright colors, especially in purple light, blue light, and red light, with obvious effects.