Red Phosphorus Method And Aluminothermal Method

Red phosphorus method
Some firecrackers use a mixture of red phosphorus and potassium chlorate to ignite and explode, rather than saltpeter, and are usually used in the production of dropped firecrackers. Other firecrackers that require ignition are strictly prohibited from using potassium chlorate as a detonator by the state, and potassium perchlorate is always used because potassium chlorate is unstable and can easily explode when made into firecrackers due to friction and impact. Potassium perchlorate is relatively stable.
Aluminothermal method
Some large firecrackers also use aluminothermal reactions to achieve strong light effects.
The aluminothermal agent is a reaction between metal oxides and aluminum, which is an exothermic reaction that typically occurs at high altitudes and explodes.