Another thing is genetic technology.
It involves modifying Muzan's blood through genetic encoding technology.
However, in this era, even with the knowledge and technology, it would be very difficult to achieve.
After re-checking and reinforcing the seal, Qingshui swiftly placed the sealed test tube containing the fleshy mass into a safe.
He locked it, added another layer of seal on the outside, and then hid it under a floor tile.
This was because, through his Transparent World perception, Kocho Shinobu was approaching.
Less than ten seconds later, Kocho Shinobu, carrying a lantern made from a Fluorescent Lamp, arrived at the door and knocked.
"Come in."
Upon receiving permission, Kocho Shinobu gently pushed the door open.
"Qingshui, what are you doing…?"
"This is the blood of Upper Rank Two and Upper Rank Five. I'm researching if there's a medicine that can turn demons back into humans."
Qingshui pointed to the two test tubes as he explained to Kocho Shinobu.
"Turn demons… back into humans?"
"Regardless of whether it succeeds, it's worth a try. Didn't we say that our generation has the best chance to eliminate Muzan? Muzan is very powerful, and even I'm not sure I can win. But if we can find an opportunity, if we can turn Muzan from a demon back into a human, would he still have his current power?"
That makes a lot of sense.
Kocho Shinobu also became interested.
"If I have time, I can help with the research. Perhaps we could take a little blood from Tanjiro's sister as a sample; she's a very special demon, unlike other demons who suffer from excessive bloodlust."
Qingshui nodded gently.
"That would be great! When it comes to understanding demons and their weaknesses, you're the most knowledgeable researcher in the Demon Slayer Corps.
Also, I can leverage my family connections to invite some biomedical scientists to assist. That would significantly increase our chances of success."
Kocho Shinobu looked at Qingshui and said, "Let's talk about those things tomorrow. I came to see you tonight for something else."
Qingshui's movements involuntarily paused.
It was the middle of the night, just a man and a woman…
"Ahem, well… this is my first time. Should we prepare some safety measures?"
This time, it was Kocho Shinobu who was stunned.
"What first time? But the safety measures are already prepared."
Qingshui's heart skipped a beat.
However, Kocho Shinobu's next sentence immediately made him feel a bit awkward.
"Sanemi and Uzui caught a few demons and have them locked up in the forest. There are many Wisteria Flowers planted there, and there are always Hashira and Demon Slayer Corps members guarding them, so safety measures are definitely sufficient.
They heard about the Fluorescent Lamp and want to test its effect. If it works, then we will try our best to popularize the Fluorescent Lamp within the corps, and the Master will also use his connections to promote it."
So that's what she meant by safety measures…
"Then let's use this to test it."
Qingshui picked up a piece of bamboo from the table.
This was a flashlight he had made using a Fluorescent Lamp, powered by a zinc-carbon battery.
The capacity of this battery wasn't large, but it was the highest capacity battery Qingshui could produce given the current era's technology.
Qingshui and Kocho Shinobu tidied up the things in the room, grabbed the Fluorescent Lamp Flashlight, and headed into the forest.
By this time, several other Hashira had already arrived, and even Ubuyashiki Kagaya had been pushed to the scene by Amane in a wheelchair.
This was a Wisteria Flower forest. In the clearing in the center of the forest, several cages made of refined steel were placed, holding ferocious-looking demons. Their expressions were either fierce or fearful, and their hands, feet, and mouths were bound by iron chains.
"Ahem, Qingshui, Shinobu, you've arrived."
Ubuyashiki Kagaya said, looking at Qingshui and Kocho Shinobu.
"Hey, Shinobu, didn't I tell you to bring Qingshui and that Fluorescent Lamp thing? Where's the lamp?"
Shinazugawa Sanemi squatted beside a cage, frowning as he spoke.
"Of course, I brought it."
Qingshui took out the Fluorescent Lamp Flashlight and pressed the button in front of everyone.
A clear, white light immediately shot out from the front of the flashlight, shining onto the cage.
The first demon, under the light, turned to ash in just a few seconds. The second demon, which looked stronger, began to rapidly dissolve its skin and muscles upon being illuminated.
The demon also struggled non-stop but couldn't break free from the chains, meeting the same fate in just over twenty seconds.
The subsequent demons were the same; the shortest one lasted only four seconds, while the longest one lasted about half a minute.
Ubuyashiki Kagaya's face immediately lit up with joy.
The Hashira were equally thrilled.
Previously, Demon Slayer Corps members had to sacrifice their lives to defeat demons, but now, under the illumination of the Fluorescent Lamp Flashlight, demons could be dealt with so easily.
"The efficiency is still a bit low, but there's no other way. The battery only has so much power. It's not impossible to increase it; you just need to connect several batteries in series. However, while the Fluorescent Lamp Flashlight would be brighter, its size and weight would also increase, making it less convenient for members to carry." Qingshui said, closing the flashlight as he looked at the empty cage.
"No!"
The gravely ill Ubuyashiki Kagaya stood up, spurred by excitement.
Amane immediately rose to help him.
"This is an invention that will change the world and reshape the dynamic between humans and demons!"
A stream of hot tears flowed from Ubuyashiki Kagaya's eyes.
"If one day, every corner of every place is illuminated by streetlights emitting sunlight, then demons will no longer pose any threat to humanity!"
This time, he truly felt the hope of eradicating demons.
"Namu Amida Butsu... While Muzan is not eliminated, demons will not disappear, but if the Fluorescent Lamp Flashlight can be widely adopted, the threat demons pose to humans will indeed be greatly reduced." Himejima Gyomei said, also shedding tears.
"Widespread adoption isn't that simple," Qingshui said, shaking his head. "The Fluorescent Lamp Flashlight consumes far more energy than other lights. The battery in this flashlight I'm holding can only sustain illumination for about ten minutes."
"Not to mention the rare gases and vacuum tubes required. The former is expensive but can at least be mass-produced. The latter, however, is still very difficult to manufacture on a large scale with current human technological capabilities. It will certainly be achievable within twenty years, but definitely not now. And once demons discover the widespread use of the Fluorescent Lamp Flashlight, they will likely hide even deeper and become even harder to eradicate."
In his opinion, the current Fluorescent Lamp Flashlight still had many shortcomings.
"But at least this is a brilliant beginning," Uzui Tengen said, stepping forward.
"This Fluorescent Lamp Flashlight is very small and won't hinder combat. If it can't be mass-produced, could we at least make a small batch to equip the weaker members of the Corps to reduce casualties?" Shinazugawa Sanemi asked, his eyes fixed on the Fluorescent Lamp Flashlight.
The other Hashira also immediately offered their opinions.
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