Chrome , Senku, and Ginro celebrate as they shout, "We've obtained sulfuric acid!"
After all the drama at the sulfuric acid pool and back at the village, Senku’s science, Chrome’s loyalty, and Ginro’s bravery win the day. They’ve secured sulfuric acid! Now, they can continue their roadmap and progress Stone Age science in the upcoming episodes! #DrStone 1.12.23
Ruri says, "... from generation to generation, without fail."
Kohaku listens as Ruri says, "We must avoid the breach of the Hundred Tales at any cost."
We’ll learn more about the Hundred Tales in a future episode, but it’s good to know that Senku may not be totally on his own with handing down scientific knowledge and preserving everything known in human history. #DrStone 1.12.22
The village chief asks his daughters Kohaku and Ruri, "Do you know what the most important duty of the priestess is?"
Ruri says, "The Hundred Tales."
Ruri says, "The knowledge kept within the hundred stories must be passed down..."
Remember the Knowledge Ark we talked about? It seems as if someone at the village had a plan for it all along. Ruri mentions the Hundred Tales, passed down from generation to generation, but we don’t quite know what they are just yet. #DrStone 1.12.21
Senku, wearing his gas mask, says, "It's a ridiculously simple concept."
Senku, wearing his gas mask, says, "Freak out too much, and you die."
Senku tells Ginro, who grabbed Chrome's gas mask while saving him, "All the activated charcoal and potassium carbonate will keep you ..."
Senku tells Ginro, "... safe from the poison gas, I promise."
The gas masks work, but things go wrong at the water’s edge. Senku is saved by Chrome, who is saved by Ginro, who is saved by Senku. It turns out they needed more than just the two science-users to keep the knowledge alive. #DrStone 1.12.20
Chrome, wearing his gas mask and staring into the blue-green vapor, hears Senku say, "There are no do-overs."
Chrome stares at the red-eyed Sulfurina as she approaches, reaching out a hand to him. Chrome asks, "Do we really stand a chance against this instant-death poison gas?"
Senku, also wearing his gas mask, says to Chrome, "If you stand around huffing and puffing in fear, ..."
Senku, also wearing his gas mask, says to Chrome, "... you'll end up overwhelming the gas mask's ability to clean the air."
Divers learn how to breathe underwater to preserve air in their scuba tanks, firefighters learn how to properly breathe using their respirators to keep them safe. Senku impresses upon Chrome the limits of their makeshift gas masks: eventually, the H2S will overwhelm the filters. #DrStone 1.12.19
A black powder is poured into a tube using a leaf as a filter, as Senku says, "That gives us this black powder, "
A black powder is poured into a tube using a leaf as a filter, as Senku says, "... activated charcoal, mixed well with potassium carbonate."
A black powder is poured into a tube using a leaf as a filter, as Senku says, "It'll neutralize and catch the poison gas."
Chrome straps on his gas mask, which is connected via a flexible tube to a bamboo container filled with activated charcoal, with an exhaust vent made of glass at the top
Remember when Senku restored the blackened silver spear by rubbing it with a basic solution? Something similar happens here: potassium carbonate neutralizes the hydrogen sulfide, which would result in potassium sulfate and carbonic acid, which rapidly converts to water and CO2. #DrStone 1.12.18
Chrome, Kaseki, Kohaku, and Suika watch as Senku uses a lens to light a fire beneath bamboo in their furnace, as Senku says, "This is the same as when we made Edison's light bulb."
Senku uses a lens to set fire to kindly beneath stacks of bamboo as Chrome watches. Senku says, "First, we steam-roast some bamboo."
A bowl of charcoal is shown, with Senku saying, "Add potassium carbonate, which is extracted from ash."
Senku pours liquid into the charcoal and says, "We also used this to make ramen."
Senku’s gas masks will rely on activated carbon to soak up and neutralize any toxic gases that are breathed in. Carbon is “activated” in order to greatly increase its surface area. It’s used in many applications, including air filters in respirators. #DrStone 1.12.17
A picture of the Earth from space as Senku says off-screen, " ... all science will disappear from the face of the Earth."
Chrome and Senku, wearing respirators and lab coats, standing back to back, as Senku says, "The best bet is for us science users to tag team."
Chrome and Senku, wearing respirators and lab coats, standing back to back, as Senku says, "We can save each other if it comes to that."
Senku says to Chrome, "Damn it, now we have to make another gas mask, thanks to you."
Senku’s only hope now lies in Chrome, who alone might understand the scientific knowledge he’s about to impart on him, but may also save Senku if anything happens to them while attempting to collect sulfuric acid. But first: back to the gas masks! #DrStone 1.12.16
Senku says to Chrome, with the starry night sky above them, "... all two million years of human civilization, to you, right now."
Sulfurina, the deadly vapor personified as a green-haired woman, looms behind Senku in his gas mask, as he says, "But the only way to cure Ruri's disease is to..."
Sulfurina, the deadly vapor personified as a green-haired woman, looms behind Senku in his gas mask, as he says, " ... charge into the poison gas and get some sulfuric acid."
Senku says to Chrome, in a close-up on Senku, "If the two of us DO go down together, in that instant,"
A conversation topic that comes up among scientists and curious folks: How would you preserve knowledge that might survive the end of the world, or at least human civilization? This knowledge ark makes for a fascinating thought experiment with many interesting possible solutions. #DrStone 1.12.15
Senku says to Chrome, "All humans die eventually."
Senku says to Chrome, "But knowledge doesn't."
Senku says to Chrome, "It's been passed down for two million years."
Senku says to Chrome, with the starry night sky above them, "I'm going to pass down all the science I know."
Chrome raises an important question: If Senku goes down, who will be left with the knowledge to save Ruri and the wider world? It’s at this point that Senku realizes that passing on everything he’s learned is more important than rushing through their roadmap. #DrStone 1.12.14
Senku continues to look at his mask, saying, "An error would mean our death."
Senku tells Chrome, "These gas masks aren't guaranteed to work."
Chrome asks Senku, "Who's going to save Ruri if all the scientists go down?"
While Senku may trust science to save his life, it’s a different story when it comes to trusting his handiwork in an untested device. Ancient Greeks may have used sponges, but early respirators didn’t arrive until the late 1700s. A more recognizable gas mask was invented in 1847. #DrStone 1.12.13
Senku paints something onto a stitched together tube, saying, "The only way to fight a chemical enemy is with chemistry."
Senku looks at his version of the gas mask
A sunset scene over the village as Senku says off-screen, "We'll have to see how much poison we can breathe through this."
Senku looks at his mask as Chrome and Kaseki look on, saying, "We can't rely on trial and error this time."
Wait, gas masks? In the Stone World? Isn’t that a pretty advanced tech with primitive tools available? Well, Senku has already given us a clue or two as to how his bootleg gas masks might just save their lives. #DrStone 1.12.12
Senku tells Chrome and Kohaku, "We need to secure a source of sulfuric acid anyway,"
Senku tells Chrome and Kohaku, "... or chemistry won't develop any further."
Senku says, "We're going to make gas masks."
Senku takes the silver spear and says to Ginro, "Let's get going to the sulfuric acid spring."
H2S is used to produce sulfur, as well as making rubber, dyes, and pharmaceuticals, and extracting certain minerals, like copper and nickel. SO2 is a food and beverage preservative. Both are used to produce sulfuric acid, used for fertilizers, detergents, and various chemicals. #DrStone 1.12.11
A blue-green pool is shown, as Senku says off-screen, "The poison gases that form here,"
A blue-green pool is shown, as Senku says off-screen, "...hydrogen sulfide and sulfur dioxide, are heavier than air."
A blue-green pool is shown with crows on the rocky rim, as Senku says off-screen, "They settle in dips like this one."
A blackened silver spear blade is shown, as someone asks, "And we can't make the cure-all drug for Ruri without this sulfuric acid stuff?"
Hydrogen sulfide and sulfur dioxide are both heavier-than-air gasses, meaning they collect in low-lying areas. H2S smells like rotten eggs while SO2 smells like burnt matches. They’re chemically important and naturally produced, but they pose a problem for Senku. #DrStone 1.12.10
Senku leans on the rocks and says, "We've found the source of the materials that were our greatest hurdle."
Ginro, Chrome, Senku, and Kohaku look down into a blue-green pool, as Senku says, "It's so divine and beautiful..."
Senku looks down into a blue-green pool, and says, "It's this green water that we're here to collect."
Senku looks down into a blue-green pool, and says, "But the geography bugs me."
Why is Senku venturing into areas with such dangerous materials as sulfuric acid, hydrogen sulfide, and sulfur dioxide? It’s necessary for the antibiotics needed to save Ruri, but also essential for future science that Senku has planned. #DrStone 1.12.9
Senku rubs a cloth on the blackened silver spear, saying, "Rub the black sulfuric acid sludge..."
Senku rubs a cloth on the blackened silver spear, saying, "... with some kind of alkaline base, and it'll turn silver again."
Senku rubs a cloth on the blackened silver spear, saying, "Even rubbing it against the warm ashes will do it."
Senku holds up the shiny silver spear and says, "The poison gas sensor's back!"
The silver spear isn’t a one-time use item. Much like tarnished silverware, it can be cleaned up rather easily with an alkali solution, like baking soda in water. Senku mentions rubbing ashes on the silver also works since the ashes contain basic chemicals, like carbonates. #DrStone 1.12.8
The black and white scientists are shown with a blue-green haze just above ground level. Senku says off-screen, "There was hydrogen sulfide as his head's height when he knelt."
The black and white scientists are shown with a blue-green haze just above ground level. Senku says off-screen, "This is an accident that actually happened."
Chroem and Suika look on in shock as Senku says off-screen, "Humans don't stand a chance when Mother Nature wants us dead."
Senku gives a grim smirk as he says, "We're going to make gas masks."
Deaths from H2S still happen today: at hot springs, in manholes and sewers and in factory accidents. Each such incident occurred in the last year or so: japandaily.jp/four-workers..., www.csb.gov/us-chemical-..., www.asahi.com/ajw/articles... Senku's story, however, remains a mystery #DrStone 1.12.7
Senku lays a hand on Kohaku's shoulder and says, "Back in my age, there was a group..."
Senku lays a hand on Kohaku's shoulder and says, "... that went to do research around an area of sulfuric acid like this one."
A research team is shown in black and white. Senku describes the scene, saying, "The man in front knelt for a moment, maybe to tie his shoelaces."
A close-up on Senku as he says, "He was dead."
At increasing concentrations of H2S, things get worse: 100+ ppm, eye irritation and loss of smell; 500ppm, staggering and collapse in 5 minutes; 700+ ppm, collapse in 1 or 2 breaths; 1,000+ ppm, nearly instant death. www.osha.gov/hydrogen-sul... #DrStone 1.12.6
Sulfurina, an undead angel woman emerges from a blue-green haze, as Senku says off-screen, "Sulfuric acid."
An ancient scientist in robes holds up a flask of blue-green liquid as Senku says off-screen, "It was discovered around the 8th century, in midst of alchey research."
Senku looks at the camera and says, "In my time, it was a chemical that served as the foundation..."
Senku looks at the camera and says, "... for all kinds of chemical industries..."
Silverware doesn’t exactly tarnish immediately, though our kitchens aren’t normally highly concentrated H2S environments either. The concentration of H2S that’s “immediately dangerous to life and health,” limiting your ability to escape, is 100ppm, or 0.01%. #DrStone 1.12.5
Senku tells Chrome, "Silver reacts with hydrogen sulfide and turns black instantly..."
The silver spear is shown starting to turn black in the presence of hydrogen sulfide.
Elemental silver on the spear reacts with hydrogen sulfide in the presence of oxygen in the atmosphere to produce silver sulfide and water, essentially tarnish or patina. Ag2S is a dense black solid, making it a great indicator for the presence of H2S. #DrStone 1.12.4
Senku, holding the silver spear, says to Ginro, "That's what I made it for."
A close-up of the silver spear shows Ginro in the reflection. Senku says off-screen, "If that silver spear turns black..."
A close-up on a serious Senku, who says, "A few seconds later, you'll be dead."
Senku, still holding the silver spear, tells Ginro, "You need to get away within 0.1 seconds."
The silver strands Chrome was holding were native silver, which can appear in nature if it hasn’t combined with other minerals. And Senku presumably used the same metal-coating process he did for Kinro’s golden spear. But this one’s special: It will alert them to the presence of H2S. #DrStone 1.12.3
Chrome stares at long silvery strands of native siler, asking, "So this thin hair-like stuff is going to turn into silver?"
Chrome says to Senku, "Damn... I thought they were roots from some plant."
Ginro, crying with hearts in his eyes, holds up his silver spear and says, "I finally have a silver spear!"
Senku, holding the silver spear, says, "This silver spear is a sensor."
Which came first: the silver spear or the sulfuric acid? Well, in this episode, Senku has to explain to the team that they’re going after sulfur, but more to the point, they’ll need a silver spear to get it. Why? Because H2S could kill them if they can’t detect it. #DrStone 1.12.2
scrap of parchment that reads Buddies Back to Back in English and Japanese
There’s quite a bit of science to discuss in this episode. Senku is even making some rather advanced equipment for a necessary quest. But it all comes down to two things: sulfur and silver! #DrStone 1.12.1
...The way they make round tanks for biofuel gas makes maybe the most sense out of a lot of what they show in #DrSTONE
Oh, hey. #DrSTONE is back.
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Boichi and Riichiro Inagaki's "Dr. Stone" S4, Part 3 gets an English dub.
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#Crunchyroll #Boichi #RiichiroInagaki #DrStone #Manga #Anime
