Chakra paper, as the name suggests, can detect the Chakra nature a Ninja possesses.
Fire: The paper will catch fire.
Wind: The paper will split in the middle.
Lightning: The paper will wrinkle.
Water: The paper will get wet.
Earth: The paper will crumble.
Uchiha In's situation indicates that he currently possesses Chakra with four natures: Fire, Lightning, Water, and Earth, which is truly unexpected.
Because in Uchiha Mikoto's understanding, every Ninja usually only possesses one or two Chakra natures when they are young.
Only after growing to the Jonin level can they learn Ninjutsu of natures they don't originally have, and simultaneously acquire new natures.
However, in such cases, the newly acquired natures are not as powerful as the original ones, so most Ninja Cultivate their original Chakra nature to be the strongest, with others only being supplementary or for backup.
Just like Kakashi in the original work, Lightning Release was his inherent nature, while other natures were copied by his Sharingan.
In every battle, he tended to use Lightning Release Ninjutsu.
And Uchiha In, 'naturally' possessed four Chakra natures, making him a Genius.
Of course, Uchiha In was not born with four Chakra natures; his Chakra natures should have been Fire and Lightning, the standard Chakra natures of the Uchiha Clan. It was just that not long after he became Tsunade's disciple, the System suddenly rewarded him with Water and Earth dual-natured Chakra.
However, Uchiha Mikoto, of course, didn't know about this, so she naturally assumed Uchiha In was born with four Chakra natures.
"Just one more, Wind, and my Chakra natures will be complete!"
Uchiha In looked at the Chakra paper in his hand and muttered to himself.
"Four Chakra natures are already very impressive. This is the first time I've seen someone with so many Chakra natures."
Uchiha Mikoto saw that Uchiha In seemed unsatisfied and gently tapped his shoulder, as if implying he was being a bit greedy.
Uchiha Mikoto herself only had one Chakra nature, Fire. Yet, this little brother In, with four Chakra natures, was still not satisfied.
Uchiha In also gave an embarrassed smile, as if he realized he was being a bit too ambitious.
However, to live safely in this world, the stronger one's power, the better.
Now, Uchiha Mikoto was suddenly full of confidence that Uchiha In could learn Fire Release within a month. After all, if Uchiha In was truly that kind of Genius, it was possible for him to successfully learn Fire Release in a month.
Thinking of this, Uchiha Mikoto's gaze towards Uchiha In also shone brightly.
"Alright, In, it's good that you have Fire Release Chakra. Next, I'll teach you Fire Release Ninjutsu."
Thinking of this, Uchiha Mikoto didn't waste any time and began teaching Uchiha In Fire Release.
"To learn Fire Release, the first things you need to learn are the nature transformation of Fire Release Chakra, and the form transformation of Chakra."
"I'll start with Chakra nature transformation."
Uchiha Mikoto took out a box of leaves from the side, her expression serious, and spoke to Uchiha In.
She picked up a small leaf and demonstrated.
"Actually, every change on the Chakra paper is the best manifestation of that nature's transformation."
"In Chakra paper, Fire Release Chakra makes the paper burn, Earth Release Chakra makes the paper crumble, Water Release Chakra makes the paper wet, and Lightning Release Chakra makes the paper wrinkle."
"And what you need to do now, In, is to hold a leaf without forming hand signs, and then make the leaf undergo a Fire Release transformation."
"Just like this."
Uchiha Mikoto placed the leaf in her palm, brought her hands together, circulated Chakra, and then separated her hands, revealing the leaf inside.
The entire leaf had already ignited.
"This is the nature transformation of Fire Release, and it's also the most basic step for using Fire Release. In, you try it first."
After Uchiha Mikoto finished speaking, she handed a small leaf to Uchiha In.
Uchiha In gently took the leaf, placed it in his hand, and then circulated Chakra.
"In, don't rush. It usually takes about a week for a normal person to successfully learn Chakra nature transformation and roughly master it..."
Just as Uchiha Mikoto was about to say something more, she suddenly saw that the leaf in Uchiha In's hand had already ignited!
Chapter 38: Chakra Nature Transformation
"Mikoto-nee, I passed, right!"
Uchiha In looked at the slightly dumbfounded Uchiha Mikoto, scratched his head, and said.
Uchiha In originally shouldn't have known the nature transformation of Fire Release, but it seemed that this morning, when he was holding Uchiha Mikoto, the System prompted him that he had learned it.
So, for Uchiha In, making this leaf burn directly was not difficult at all, and he did it with great ease.
It was just that his performance seemed too astonishing, making Uchiha Mikoto show a very surprised expression.
Was he too much of a Prodigy, too abrupt in his display? Should he have progressed gradually instead?
Looking at Uchiha Mikoto, who was still in shock, Uchiha In couldn't help but think.
However, in front of Mikoto, it didn't matter. He believed Uchiha Mikoto wouldn't harm him like other malicious people, so it didn't matter.
Indeed, Uchiha Mikoto's heart was already in turmoil. She was very surprised when Uchiha In had four Chakra natures, but she could still accept it.
However, Uchiha In being able to complete Chakra nature transformation in such a short time made Uchiha Mikoto a bit unable to accept it.
One must know, when Uchiha Mikoto first started learning Chakra nature transformation, it took her two weeks just to scorch these leaves, and she had already received praise from Uchiha Itachi.
Being able to scorch these leaves could already be considered a preliminary mastery of Chakra nature transformation. Burning the leaves, however, was something Uchiha Mikoto only achieved after becoming a Genin, reaching that level of Chakra nature transformation.
And Uchiha In? He successfully made the leaf burn the very first time he learned Chakra nature transformation...
Uchiha Mikoto didn't know if she was too stupid, or if her cousin was too much of a Prodigy.
Perhaps, Uchiha In had learned Chakra nature transformation before?
"In, you've learned Chakra nature transformation before, haven't you?"
Uchiha Mikoto asked Uchiha In.
"No, this is my first time learning it."