Put a certain amount of potassium nitrate into a pot, add water (soak one finger on the surface of potassium nitrate for a long time, soak two fingers for a long time), and then boil over high fire. When the salt water is boiled until it is scooped up with a wooden shovel and drips into a long white wax shape, it means that it has been boiled. At this time, heating should be stopped. When the brine is not boiling (above 100℃), add a certain amount of charcoal powder and keep stirring. When the temperature drops to about 40 degrees, add a certain amount of sulfur powder and keep stirring until it is uniform.
In addition, you can also use the cold mixing method, which can be mixed evenly after crushing, but the quality of this method is poor. The lead tie is divided into an upper part and a lower part. Before winding, the lower part of the lead tie is placed in the shearing groove, and after winding, the upper part of the lead tie is placed above the lead. Paper tubes are tied into hexagonal cakes with hemp rope, which is convenient for counting the number of tubes.
Fireworks type
Fireworks are also called fireworks, fireworks, fireworks and firecrackers. According to "China Fireworks and Firecrackers Standard-Safety and Quality", fireworks and firecrackers are defined as entertainment products that use pyrotechnics as raw materials and produce acousto-optic colors. Working people in China invented it earlier, and it is often used for grand ceremonies or performances.
Fireworks are actually similar in structure to firecrackers, and they all contain black powder and medicine. In order to achieve good performance, fireworks and fireworks bombs are filled with a lot of gunpowder for launching and explosion. For example, a fireworks bomb with a diameter of 20 cm will explode only when it rises to a height of about 200 meters after launch, and the radius covered by these points can be about 80 meters.