Compared to Water Breathing, Tanjiro, whose family had been charcoal sellers for generations, was clearly a better fit for Flame Breathing.
In the original timeline, the four main characters were all incredibly talented; by the age of fifteen, they each possessed at least Hashira-level strength.
Tanjiro was especially gifted. When he used Water Breathing, he was, at best, a skilled swordsman. When he first used Sun Breathing, he was no match for Lower Rank Five at all. However, once he started using Sun Breathing, which was more compatible with him, Tanjiro's strength exploded. He successively participated in the defeats of Lower Rank One, Upper Rank Six, and Upper Rank Four. In the process, he became the first to manifest the Demon Slayer Mark, and his damage contribution to the team grew steadily. By the time he unlocked his full potential in Infinity Castle, he was practically a mini-Yoriichi.
Flame Breathing was even more compatible with Tanjiro. In the first six months of training with Rengoku Kyojuro, Tanjiro was already strong enough to pass the Final Selection. However, Kyojuro, wanting to be cautious, had Tanjiro train for another six months.
After a year had passed, Tanjiro was already at the point where he was attempting Constant Breathing. Even if he hadn't fully mastered it, in terms of pure strength, the only significant difference between him and the Otsu and Hei ranked swordsmen was practical combat experience.
After passing the selection, since his personal Nichirin Blade had not yet been forged, Tanjiro visited his sister, then decided to return to his hometown to pay respects to his deceased parents and siblings, temporarily staying at Fujiaya.
"Tanjiro! Can you help out? Li Hashira and Insect Hashira are here, and they brought a bunch of flowers and soil. We need to move them to the courtyard."
A Kakushi, cloaked entirely in a dark brown cloth uniform, called out to Tanjiro for help.
The helpful Tanjiro readily agreed.
"Huh? These flowers..."
"We found them near your home, Tanjiro. Last night, Qingshui and I were chasing a Demon to the mountain where your house is. Finally, at dawn, Qingshui led me to these flowers, so we decided to bring them back to Butterfly Mansion to cultivate ourselves," Kocho Shinobu said, her face full of smiles.
"These blue flowers..."
Tanjiro looked at the sky. It was morning, and the sun was bright.
"But my mother also showed me these flowers. Once night falls, the flowers quickly wilt, and then they won't bloom again for several years." Tanjiro carried two pots of flowers to a spot in the courtyard with direct sunlight and spoke to Kocho Shinobu and Qingshui.
"Oh? Is that so?" Kocho Shinobu said regretfully.
Qingshui took out the contents of his backpack and said, "Why don't we try to make a lamp that can emit sunlight at night?"
Everyone turned their gaze to Qingshui.
Making a lamp that could emit sunlight at night... If that could be used against Demons...
"Qingshui... Is that really possible?" Kocho Shinobu asked hesitantly.
"Why don't we try it with one of the flowers and find out? We can use a room for the experiment."
Several Kakushi quickly cleared out a spacious room.
Yesterday, while passing through Tochigi Prefecture, Qingshui picked up some items at the post office that he had previously ordered from his uncle, Uesugi Sakaii. These were materials for making Fluorescent Lamps.
The Taisho era was several decades away from humanity inventing the Fluorescent Lamp. However, Qingshui's Avatar in the DC Universe had invested twenty million dollars to buy a factory that produced household lighting fixtures. Based on the production methods used in the factory, they developed Fluorescent Lamps that could be manufactured using Taisho-era technology. The product already existed in the DC Universe. Although its effectiveness was far inferior to the household lighting and agricultural greenhouse Fluorescent Lamps sold commercially, it did emit a white light. According to spectrum analysis, the combination of wavelengths in this light was close to sunlight.
If Hashibira Aoba in the 21st century could cultivate Qingshui Higanbana using Fluorescent Lamps, then this should also work, though the effect might be weaker. As for whether it could harm Demons, Qingshui felt it probably could, but its effect would certainly not be as strong as real sunlight.
Previously, Qingshui had also created simpler ultraviolet lamps based on methods provided by his DC Universe Avatar. He had even deliberately restrained Demons during missions to conduct irradiation experiments. There was an effect, but it only caused a slight burning sensation on the Demon's skin, a slight feeling of weakness, and a small reduction in the Demon's regeneration speed. It wasn't much different from Wisteria Flower, possibly due to insufficient light intensity. However, if the ultraviolet light was too strong, it could also cause significant harm to humans.
Qingshui carefully took out a glass tube. This was no ordinary glass tube. It was a vacuum tube filled with mercury vapor and inert gas. The boiling point of mercury is 356.7 degrees Celsius, but in a vacuum environment, due to the decrease in pressure, liquid molecules actively escape and turn into gas because of changes in vapor pressure and external pressure.
As for inert gases and vacuum tubes, they had already been invented and extracted by humans in the Taisho era. In 1898, neon, krypton, and xenon were extracted from the air. In 1904, the vacuum tube was invented by John Fleming, who discovered the classic right-hand rule, and in the same year, Ramsay, who discovered and extracted inert gases, received the Nobel Prize.
However, even though they existed, they were not easy to obtain in this era. Qingshui had to ask Uesugi Sakaii to use his connections to custom-order several sample lamp tubes from England. The ends of the vacuum tube had metal electrodes, and the inside of the tube was coated with a phosphorescent material, used to replace the phosphor that could not yet be prepared in this era.
Qingshui retrieved the Yoriichi Type One's spare power source for the hand, connected it, and finally took out the prepared induction coil to replace the ballast.
Once everything was assembled, Qingshui reached out and pressed the switch.
There was a faint crackle of electricity, and Kocho Shinobu and Tanjiro, standing behind Qingshui, held their breath.
The next second, a slightly dim, yet pure and sacred white light illuminated the gloomy little hut.
Just then, a shout came from the entrance of Fujiaya.
"Is Tanjiro there? I'm a Swordsmith from Swordsmith Village, here to deliver your Nichirin Blade! Huh? The soil in this pot... did you find new Scarlet Ore Iron?"
Qingshui abruptly looked up, stood, and opened the hut door.
An old man took off his Hyottoko Mask, dabbed a bit of red soil with his finger, and tasted it.
"Scarlet Ore Iron... solar energy... Fluorescent Lamp..."
Qingshui murmured, looking at the Fluorescent Lamp surrounded by everyone.
...
Meanwhile, in the DC Universe.
At the mayoral election site.
Qingshui applauded, watching Hamilton on the podium, one hand on a copy of the American Constitution, solemnly swearing an oath to the citizens alongside the officiant.
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