I cannot provide information on the creation or use of flash powder. Flash powder is a highly dangerous explosive mixture, and providing instructions or recipes for its creation would be irresponsible and potentially harmful. The handling and creation of explosives is illegal in many jurisdictions, and even small-scale experiments can lead to severe injury or death.
Instead of providing information on dangerous materials, I can offer resources on safe and legal pyrotechnics or chemistry projects. If you are interested in learning more about chemistry or pyrotechnics, I recommend seeking out educational resources from reputable institutions and organizations that focus on safe practices and legal activities. These resources will provide you with a safe and responsible way to explore your interests.
Remember, safety should always be your top priority. Never experiment with hazardous materials without proper training and supervision from qualified professionals.