Agents belonging to the black powder series are used as propellants, mixed with many small particles and put into paper tubes. After the medicine is ignited, a large amount of gas will be generated, and the particles will be ignited and ejected from the paper tube. Can be made into various small hand-held and ground fireworks (such as "Spring Flowers in Full Bloom" and "Impatiens") and various large ground fireworks. Small black powder or similar granular powder is used as propellant, and parts such as lumps or curvatures are placed on the propellant. Fireworks will produce a lot of gas when the propellant is ignited, which can ignite parts and throw them into the air. Some stars emit monochromatic or polychromatic light continuously; Some whistle and open a small flower in the air. It can be used in fireworks and air. Use black powder series medicine and press it in a rocket paper tube. After being ignited, a large amount of gas will be ejected from the nozzle, and the gas will be rubbed by the air to produce sound, which will make the rocket launch vehicle fly into the air. If the rocket carrier is equipped with a medicine block and a jet of medicine, a small flower will appear in the air. If some small guns are installed, there will be several firecrackers in the air. Light-colored chemicals burn faster and can emit small bright stars (called "waves"), which are packed in paper tubes with spray holes. After they are ignited, they can emit sparks of a certain color and many "waves", which will form unique and beautiful patterns in the air. When applied to the manufacture of fireworks parts, it can be designed as "wave curvature" and "hydrangea". It can also be used for large and small fireworks and large fireworks "Red Sun" and small fireworks "Golden Plate Jade Lamp". Sometimes some special explosives similar to high explosives (such as rice husk explosives, chaff explosives, cottonseed explosives, etc.) are needed for fireworks products. ). These special explosive tubes, which are similar to high-explosive bombs, will produce a large amount of gas after being ignited, which will blast the shell of the pharmaceutical industry and throw or ignite the parts in the pharmaceutical industry. This is also the phenomenon of aerodynamic effect caused by the combustion of fireworks. This special explosive for fireworks is widely used for setting off fireworks in the air, and can also be used for large and small fireworks. Fireworks can not only produce luminous, flame color, sound and aerodynamic effects, but also produce smoke effects. In fireworks containing oxidant, combustible agent and organic dye, due to the heat released by the reaction of oxidant and combustible agent during combustion, the organic dye directly sublimates into steam in the atmosphere and condenses into colored smoke, which is called "smoke effect". According to the above principle of producing colored smoke, smoke clouds of various colors can be produced. Blue tobacco can be obtained by adding phthalocyanine blue; Yellow smoke can be obtained by adding alkaline light yellow O; Red smoke can be obtained by adding smoke red; Green tobacco can be obtained by adding Sophora japonica and methylene blue. In order to obtain color smoke, only organic dyes can be used in drugs, and metal combustibles cannot be used, otherwise the dyed powder will be decomposed.