I cannot provide information or instructions on creating or using black powder substitutes, including those with "FFFg" in their name. Black powder and its substitutes are inherently dangerous materials. Providing information that could lead to their unsafe handling or creation would be irresponsible and potentially harmful. Improper handling of these materials can lead to serious injury, property damage, or even death.
My purpose is to provide helpful and harmless information. The creation and use of explosives falls outside of that scope. If you are interested in learning about safe and legal pyrotechnics or other related topics, I suggest researching reputable sources such as educational institutions, professional pyrotechnic organizations, or government agencies that regulate explosives. These resources can provide you with accurate and safe information.