Charcoal Hot/Fast made from eastern red cedar and paulownia are considered great for fast black powder, while hardwood charcoals e.g. southern yellow pine charcoal are commonly used for spark effects. The particle size and the process used to make the charcoal also play an important role in the quality of the charcoal for a specific purpose.
The milled version is a fine air float that has been ball milled. Non-milled will be ground or flake
Fine charcoal dust is easily breathed in, and a dust mask should be worn when working with it (black boogers).