Black Powder Composition?

I heard that you can make black powder from a 74/26 Potassium Nitrate/Charcoal mix. But, I'm wonder about the sulpher... Isn't it neccecary?Black Powder Composition?
Gunpowder, also named black powder, is a mixture of sulfur, charcoal, and potassium nitrate. It burns rapidly, producing volumes of hot solids and gases which can be used as a propellant in firearms and as a pyrotechnic composition in fireworks.





Proportions by weight are 75% potassium nitrate, 15% softwood charcoal, and 10% sulfur.





These ratios have varied over the centuries and by country, and can be altered somewhat depending on the purpose of the powder. For instance, low power grades of black powder, unsuitable for use in firearms but adequate for blasting rock in quarrying operations, is called blasting powder rather than gunpowder with standard proportions of 70% nitrate, 14% charcoal and 16% sulfur; blasting powder may be made with the cheaper sodium nitrate substituted for potassium nitrate and proportions may be as low as 40% nitrate, 30% charcoal and 30% sulfur.