After finishing making all the pen, Jin decided to teach Elsa how to make rubber balls.
Land A went to bring the sap-collecting container they had set up yesterday.
“See, this is raw rubber.”
“Raw rubber…”
Elsa was curiously looking at the sticky, white substance stored inside the container.
“At this rate, it will become all muddy in the heat and harden in the cold. There’s a way to make it firm to a certain degree.”
“……..”
Elsa was listening earnestly.
“That’s by mixing sulphur into it. I will explain why later. And so, we will mix about 15%-20% sulphur, based on the overall weight.”
“Mm.”
Jin shifted the raw rubber to a smaller container and added a lump of sulphur into it.
“I will show you how first.”
Saying that, Jin checked the weight of the sulphur and raw rubber using analyze.
“There’s about 250 gram of raw rubber in here so we will take 38 grams of sulphur.”
He prepared the required amount of sulphur by using separation on the bigger lump of sulphur.
“We will mix this. Homogenize and heating.”
After separating the unified sulphur, if you apply heat, a reaction called ‘bridging’ occurs and raw rubber turns into just rubber and doesn’t melt even when heat is applied.
“At the end, Forming. Now, we must insert air inside it. To do that, we must make one part really thin once.”
In very thin gum’s membrane, there are countless holes big enough such that air can pass through. If you take in more air from there and increase the membrane thickness again, the air gets trapped inside.
“Then, we will make the membrane more delicate with surface treatment. And the ball is complete.”
After processing it such that the air doesn’t leak, the dodgeball was complete.
Elsa had also seen the kids play with the ball so now that she had seen how it was made, she understood.
“Now, try making one.”
Jin handed her 80 grams of raw rubber to start off small as it was her first time.
The first step was to prepare the required 12 grams of sulphur.
“Just think of doing it like before, imagine piling up 1 gram over 1 gram.”
“Mm.”
Translations by AsianHobbyist Website
Elsa earnestly remembered the 1 gram technique and accumulated 12 times inside her head. The moment that image in her head had become certain,
“Separation.”
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And brought out the required amount of sulphur. Jin, who was watching,
“Hmm, good job. There’s barely any error, that’s amazing.”
Complimented Elsa. Elsa was happy and continued the process by using magic next.
“Homogenize. Heating.”
“That’s right. Don’t forget to observe the gum while heating.”
“Mm.”
And after 1 minute of careful heating, the gum was wonderfully done. After coming this far, making the ball’s shape is a piece of cake. She processed the surface smoothly and one baseball was completed.
“You succeeded in your first try, you’ve gotten really good.”
“Thanks to Jin-nii.”
“It will be fine if the kids want more ball now, huh?”
“Yep, leave it to me.”
Seeing Elsa nod enthusiastically, Jin stood up. It was almost noon.
Just as they got out of the workshop, Hanna had also come to call them. Jin and Elsa washed their hands and went Martha’s house.
“Ah, Jin-sama.”
There were more chairs in the dining and Barou and Belle also came.
“U-umm, Martha-sama said it was okay if we had lunch together so…”
Barou was still somewhat nervous. Jin answered with a smile,
“Ah, I think that’s fine. When you get used to it, try making some in the castle, alright?”
As Jin said that, Belle energetically replied,
Translations by AsianHobbyist Website
“Yes! I am learning how to cook from Martha-sama and Mine-sama!”
“I also learnt how to make some Serroa kingdom food.”
Mine said smiling. There, Barou nervously asked,
“U-umm, Jin-sama, can I ask you a few questions?”
Jin nodded to show his consent while eating a bread.
“Y-yes, u-umm, that is, this place… it’s Kurain kingdom, isn’t it?”