Gunpowder

Lore & Background

The creation process required immense precision and risk, as the Kingdom lacked modern safety protocols or industrial machinery. Senku and his team had to source saltpeter from bat guano in caves, refine sulfur, and create high-quality charcoal through controlled burning. The successful synthesis of this mixture allowed for the first explosive use—blasting open a cave entrance during the Stone World arc—before later being adapted for combat in the War Arc. Dynamite, a distinct invention requiring nitroglycerin, was developed separately. Gunpowder's applications remained focused on blasting and fireworks, and there is no canon event involving a 'Stone Pyramid (Perseus).' The Kingdom of Science already wielded steel weapons and tools before gunpowder's combat debut, proving science was never solely reliant on physical strength and traps.

In Their Own Story

The air inside the makeshift laboratory was thick with the acrid scent of sulfur. Senku carefully measured the charcoal dust into the mortar, his eyes narrowing as he mixed it with the refined saltpeter. "One wrong move," he whispered to Gen, who held the pestle with trembling hands, "and we lose our fingers before lunch." With a final blend of sulfur added, the grey powder settled. It looked innocent, like ordinary dirt, but Senku knew better; this was the sound of thunder waiting to be unleashed.

Reader's Guide

In the real world, gunpowder is a low explosive composed of potassium nitrate (saltpeter), charcoal, and sulfur. In-universe, Senku replicates this by first harvesting bat guano from deep caves to extract saltpeter through water filtration and evaporation. Next, wood is burned in an oxygen-deprived environment to produce high-quality charcoal, which acts as the fuel. Sulfur is obtained from volcanic deposits or specific mineral sources found near the petrification sites. These three ingredients are ground together meticulously using a mortar and pestle, often with water added temporarily to prevent accidental ignition during mixing. Once dried, this mixture is packed into paper tubes or clay vessels to create dynamite or simple bombs. This invention shifts the plot by providing the Kingdom of Science with the only viable means to destroy Tsukasa's stone fortress, effectively ending the war and securing a future for civilization.

Did You Know?

• Senku chose to make gunpowder specifically because it was one of the few explosives that could be created without complex machinery or electricity.
• The saltpeter required for the mixture was sourced from bat guano, highlighting how even waste products became vital resources in the Stone World.
• Gunpowder's creation marked a moral turning point where Senku had to justify using destructive science to save humanity.
• Before this invention, the Kingdom of Science had already developed steel weapons and tools, contradicting any claim that they relied entirely on physical strength and traps.