Potassium Nitrate 75%
Charcoal 15%
Sulfur 10%
The formula for copper(II) oxide is CuO. This is the commonly met black powder. Copper(I) oxide also exists. This is a red powder, and its formula is Cu2O where the 2 should be a subscript.
The formula for iron (II) oxide is FeO. It is a black colored powder, not rust.
I'm sure there is a formula for that, but I was never good with math, The problem is CC is volume and grain is weight. I would take my 5 cc of powder and pour it into an adjustable powder measure, then adjust it until the powder is level with the top. I just did it and it turns out to about 12 grains of black powder.
Impossible to say, but it definitely happened in China not long after they perfected the formula for black powder. The Chinese first used black powder to make various types of fireworks, including firecrackers. But eventually adapted black powder based fireworks technology to warfare by scaling upward.
there isn't one, for onion powder is a powder
This formula is NaHCO3.
Formula: Au
This formula is NaHCO3.
Manganese dioxide (MnO2) is a black powder.
Black powder absorbs moisture from the atmosphere
there isn't one, for onion powder is a powder
humine powder formula is cupling pweder