Kohaku: WHAT DO YOU MEAN CHROME'S NOT GOING?!
She was surprised, anyone would be upon hearing that one of the scientists wasn't going on a science exposition.
Y/N: It's too dangerous, Senku doesn't know if the gas masks are going to work... and if one of them bites the dust, then we need someone to live.
Kohaku: That's stupid! Plus, it's not like Chrome to back down like this. It's just not his thing! And what about you? Are you not worried you'll die?
Y/N shrugged and leaned against a tree, whilst sighing
Y/N: Why should I? My best friends are risking their lives to be spies and you just want me to sit on my ass here? That's the stupid thing if you ask me
Y/N looked at a concerned Kohaku and he grinned at her
Y/N: Anyway, even if Chrome could give us any chance of a survival rate. I doubt we're going to leave Chrome here. And why, you're probably going to ask? It's because he's a stubborn bastard who won't give up on these terms, like you.
Y/N told Kohaku and stopped leaning on the tree and walked off. Kohaku watched him walk off, almost surprised that he would say all that if Senku was so adamant about lots of things which prompted her climb up a tree and perch on top of a branch right on top of the two scientists
(Timeskip)
The next day the current residents of the Kingdom of Science got together to create Chrome's gas mask.
Senku: This is just like when we made Edison's light bulb! First, we bake up some bamboo...
Senku placed the cut up bamboo into the furnace then used glass to start heating up the bamboo
Chrome: Ooh, so that's another way to use glass?
Senku nodded and started pouring potassium carbonate into a bowl of charcoal lye.
Senku: Then, add the potassium carbonate that we used in the ramen. And toss in a boatload of charcoal lye.
Then Kohaku and Kaseki started grinding the charcoal lye into a fine powder.
Senku: This black powder is activated with a bit of potassium carbonate. Which will trap the toxic gas and neutralize it!
Once the gas mask and the folter was complete Chrome had put it on, just as Y/N, Kohaku and Senku did
Senku: It's complete. Our defense against toxic gas!! Time for these two scientists to have a tag team revenge match!! Heh heh heh... this time we're gonna get that sulfuric acid!!
Senku's big speech was then followed by the delusional cries of Ginrou proclaiming that his spear was cursed by a fairy of the spring. Chrome grabbed Ginrou by the waist and began pulling.
Senku: Leave him behind. He'd only slow us down. Still, it's not a curse or anything like that. It's science.
Senku grabbed the spear and started rubbing it with ash.
Senku: The hydrogen sulfide turned it black, but an alkali should turn it back. Just rub it with some toasty warm ash and Ta-da!
Chrome: OOOH! It's the triumphant return of the toxic-gas sensor!
Y/N: Yeah and when it turns black, it's time for our gas masks to work!
Then Chrome, Senku and Y/N trekked to go and get the sulfuric acid. Once they had reached close enough to the lake for the spear to start turning black again, Chrome stopped in worry wondering if they could do this. However whilst this was happening both Y/N and Senku were skipping along if nothing was happening.
